Cell Information for Access Management

ABSTRACT

A base station central unit receives an indication that one or more cells are associated with a first closed access group. Based on the indication, the base station central unit cell configuration parameters of the one or more cells for a wireless device that is allowed to access the first closed access group. The base station central unit sends, to the base station distributed unit, a context configuration message comprising the cell configuration parameters.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/US2020/025349, filed Mar. 27, 2020, which claims the benefit of U.S. Provisional Application No. 62/824,823, filed Mar. 27, 2019, which is hereby incorporated by reference in its entirety.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings.

FIG. 1 is a diagram of an example RAN architecture as per an aspect of an embodiment of the present disclosure.

FIG. 2A is a diagram of an example user plane protocol stack as per an aspect of an embodiment of the present disclosure.

FIG. 2B is a diagram of an example control plane protocol stack as per an aspect of an embodiment of the present disclosure.

FIG. 3 is a diagram of an example wireless device and two base stations as per an aspect of an embodiment of the present disclosure.

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplink and downlink signal transmission as per an aspect of an embodiment of the present disclosure.

FIG. 5A is a diagram of an example uplink channel mapping and example uplink physical signals as per an aspect of an embodiment of the present disclosure.

FIG. 5B is a diagram of an example downlink channel mapping and example downlink physical signals as per an aspect of an embodiment of the present disclosure.

FIG. 6 is a diagram depicting an example transmission time or reception time for a carrier as per an aspect of an embodiment of the present disclosure.

FIG. 7A and FIG. 7B are diagrams depicting example sets of OFDM subcarriers as per an aspect of an embodiment of the present disclosure.

FIG. 8 is a diagram depicting example OFDM radio resources as per an aspect of an embodiment of the present disclosure.

FIG. 9A is a diagram depicting an example CSI-RS and/or SS block transmission in a multi-beam system.

FIG. 9B is a diagram depicting an example downlink beam management procedure as per an aspect of an embodiment of the present disclosure.

FIG. 10 is an example diagram of configured BWPs as per an aspect of an embodiment of the present disclosure.

FIG. 11A, and FIG. 11B are diagrams of an example multi connectivity as per an aspect of an embodiment of the present disclosure.

FIG. 12 is a diagram of an example random access procedure as per an aspect of an embodiment of the present disclosure.

FIG. 13 is a structure of example MAC entities as per an aspect of an embodiment of the present disclosure.

FIG. 14 is a diagram of an example RAN architecture as per an aspect of an embodiment of the present disclosure.

FIG. 15 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 16 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 17 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 18 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 19 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 20 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 21 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 22 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 23 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 24 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 25 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 26 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 27 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 28 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 29 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 30 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 31 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 32 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 33 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 34 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 35 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 36 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 37 is an example diagram of an aspect of an embodiment of the present disclosure.

FIG. 38 is an example diagram of an aspect of an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Example embodiments of the present disclosure enable operation of wireless communication systems. Embodiments of the technology disclosed herein may be employed in the technical field of multicarrier communication systems. More particularly, the embodiments of the technology disclosed herein may relate to radio access networks in multicarrier communication systems.

The following Acronyms are used throughout the present disclosure:

-   -   3GPP 3rd Generation Partnership Project     -   5GC 5G Core Network     -   ACK Acknowledgement     -   AMF Access and Mobility Management Function     -   ARQ Automatic Repeat Request     -   AS Access Stratum     -   ASIC Application-Specific Integrated Circuit     -   BA Bandwidth Adaptation     -   BCCH Broadcast Control Channel     -   BCH Broadcast Channel     -   BPSK Binary Phase Shift Keying     -   BWP Bandwidth Part     -   CA Carrier Aggregation     -   CC Component Carrier     -   CCCH Common Control CHannel     -   CDMA Code Division Multiple Access     -   CN Core Network     -   CP Cyclic Prefix     -   CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplex     -   C-RNTI Cell-Radio Network Temporary Identifier     -   CS Configured Scheduling     -   CSI Channel State Information     -   CSI-RS Channel State Information-Reference Signal     -   CQI Channel Quality Indicator     -   CSS Common Search Space     -   CU Central Unit     -   DC Dual Connectivity     -   DCCH Dedicated Control Channel     -   DCI Downlink Control Information     -   DL Downlink     -   DL-SCH Downlink Shared CHannel     -   DM-RS DeModulation Reference Signal     -   DRB Data Radio Bearer     -   DRX Discontinuous Reception     -   DTCH Dedicated Traffic Channel     -   DU Distributed Unit     -   EPC Evolved Packet Core     -   E-UTRA Evolved UMTS Terrestrial Radio Access     -   E-UTRAN Evolved-Universal Terrestrial Radio Access Network     -   FDD Frequency Division Duplex     -   FPGA Field Programmable Gate Arrays     -   F1-C F1-Control plane     -   F1-U F1-User plane     -   gNB next generation Node B     -   HARQ Hybrid Automatic Repeat reQuest     -   HDL Hardware Description Languages     -   IE Information Element     -   IP Internet Protocol     -   LCID Logical Channel Identifier     -   LTE Long Term Evolution     -   MAC Media Access Control     -   MCG Master Cell Group     -   MCS Modulation and Coding Scheme     -   MeNB Master evolved Node B     -   MIB Master Information Block     -   MME Mobility Management Entity     -   MN Master Node     -   NACK Negative Acknowledgement     -   NAS Non-Access Stratum     -   NG CP Next Generation Control Plane     -   NGC Next Generation Core     -   NG-C NG-Control plane     -   ng-eNB next generation evolved Node B     -   NG-U NG-User plane     -   NR New Radio     -   NR MAC New Radio MAC     -   NR PDCP New Radio PDCP     -   NR PHY New Radio PHYsical     -   NR RLC New Radio RLC     -   NR RRC New Radio RRC     -   NSSAI Network Slice Selection Assistance Information     -   O&M Operation and Maintenance     -   OFDM orthogonal Frequency Division Multiplexing     -   PBCH Physical Broadcast CHannel     -   PCC Primary Component Carrier     -   PCCH Paging Control CHannel     -   PCell Primary Cell     -   PCH Paging CHannel     -   PDCCH Physical Downlink Control CHannel     -   PDCP Packet Data Convergence Protocol     -   PDSCH Physical Downlink Shared CHannel     -   PDU Protocol Data Unit     -   PHICH Physical HARQ Indicator CHannel     -   PHY PHYsical     -   PLMN Public Land Mobile Network     -   PMI Precoding Matrix Indicator     -   PRACH Physical Random Access CHannel     -   PRB Physical Resource Block     -   PSCell Primary Secondary Cell     -   PSS Primary Synchronization Signal     -   pTAG primary Timing Advance Group     -   PT-RS Phase Tracking Reference Signal     -   PUCCH Physical Uplink Control CHannel     -   PUSCH Physical Uplink Shared CHannel     -   QAM Quadrature Amplitude Modulation     -   QFI Quality of Service Indicator     -   QoS Quality of Service     -   QPSK Quadrature Phase Shift Keying     -   RA Random Access     -   RACH Random Access CHannel     -   RAN Radio Access Network     -   RAT Radio Access Technology     -   RA-RNTI Random Access-Radio Network Temporary Identifier     -   RB Resource Blocks     -   RBG Resource Block Groups     -   RI Rank indicator     -   RLC Radio Link Control     -   RRC Radio Resource Control     -   RS Reference Signal     -   RSRP Reference Signal Received Power     -   SCC Secondary Component Carrier     -   SCell Secondary Cell     -   SCG Secondary Cell Group     -   SC-FDMA Single Carrier-Frequency Division Multiple Access     -   SDAP Service Data Adaptation Protocol     -   SDU Service Data Unit     -   SeNB Secondary evolved Node B     -   SFN System Frame Number     -   S-GW Serving GateWay     -   SI System Information     -   SIB System Information Block     -   SMF Session Management Function     -   SN Secondary Node     -   SpCell Special Cell     -   SRB Signaling Radio Bearer     -   SRS Sounding Reference Signal     -   SS Synchronization Signal     -   SSS Secondary Synchronization Signal     -   sTAG secondary Timing Advance Group     -   TA Timing Advance     -   TAG Timing Advance Group     -   TAI Tracking Area Identifier     -   TAT Time Alignment Timer     -   TB Transport Block     -   TC-RNTI Temporary Cell-Radio Network Temporary Identifier     -   TDD Time Division Duplex     -   TDMA Time Division Multiple Access     -   TTI Transmission Time Interval     -   UCI Uplink Control Information     -   UE User Equipment     -   UL Uplink     -   UL-SCH Uplink Shared CHannel     -   UPF User Plane Function     -   UPGW User Plane Gateway     -   VHDL VHSIC Hardware Description Language     -   Xn-C Xn-Control plane     -   Xn-U Xn-User plane

Example embodiments of the disclosure may be implemented using various physical layer modulation and transmission mechanisms. Example transmission mechanisms may include, but are not limited to: Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Time Division Multiple Access (TDMA), Wavelet technologies, and/or the like. Hybrid transmission mechanisms such as TDMA/CDMA, and OFDM/CDMA may also be employed. Various modulation schemes may be applied for signal transmission in the physical layer. Examples of modulation schemes include, but are not limited to: phase, amplitude, code, a combination of these, and/or the like. An example radio transmission method may implement Quadrature Amplitude Modulation (QAM) using Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16-QAM, 64-QAM, 256-QAM, and/or the like. Physical radio transmission may be enhanced by dynamically or semi-dynamically changing the modulation and coding scheme depending on transmission requirements and radio conditions.

FIG. 1 is an example Radio Access Network (RAN) architecture as per an aspect of an embodiment of the present disclosure. As illustrated in this example, a RAN node may be a next generation Node B (gNB) (e.g. 120A, 120B) providing New Radio (NR) user plane and control plane protocol terminations towards a first wireless device (e.g. 110A). In an example, a RAN node may be a next generation evolved Node B (ng-eNB) (e.g. 120C, 120D), providing Evolved UMTS Terrestrial Radio Access (E-UTRA) user plane and control plane protocol terminations towards a second wireless device (e.g. 110B). The first wireless device may communicate with a gNB over a Uu interface. The second wireless device may communicate with a ng-eNB over a Uu interface.

A gNB or an ng-eNB may host functions such as radio resource management and scheduling, IP header compression, encryption and integrity protection of data, selection of Access and Mobility Management Function (AMF) at User Equipment (UE) attachment, routing of user plane and control plane data, connection setup and release, scheduling and transmission of paging messages (originated from the AMF), scheduling and transmission of system broadcast information (originated from the AMF or Operation and Maintenance (O&M)), measurement and measurement reporting configuration, transport level packet marking in the uplink, session management, support of network slicing, Quality of Service (QoS) flow management and mapping to data radio bearers, support of UEs in RRC_INACTIVE state, distribution function for Non-Access Stratum (NAS) messages, RAN sharing, dual connectivity or tight interworking between NR and E-UTRA.

In an example, one or more gNBs and/or one or more ng-eNBs may be interconnected with each other by means of Xn interface. A gNB or an ng-eNB may be connected by means of NG interfaces to 5G Core Network (5GC). In an example, 5GC may comprise one or more AMF/User Plan Function (UPF) functions (e.g. 130A or 130B). A gNB or an ng-eNB may be connected to a UPF by means of an NG-User plane (NG-U) interface. The NG-U interface may provide delivery (e.g. non-guaranteed delivery) of user plane Protocol Data Units (PDUs) between a RAN node and the UPF. A gNB or an ng-eNB may be connected to an AMF by means of an NG-Control plane (NG-C) interface. The NG-C interface may provide functions such as NG interface management, UE context management, UE mobility management, transport of NAS messages, paging, PDU session management, configuration transfer or warning message transmission.

In an example, a UPF may host functions such as anchor point for intra-/inter-Radio Access Technology (RAT) mobility (when applicable), external PDU session point of interconnect to data network, packet routing and forwarding, packet inspection and user plane part of policy rule enforcement, traffic usage reporting, uplink classifier to support routing traffic flows to a data network, branching point to support multi-homed PDU session, QoS handling for user plane, e.g. packet filtering, gating, Uplink (UL)/Downlink (DL) rate enforcement, uplink traffic verification (e.g. Service Data Flow (SDF) to QoS flow mapping), downlink packet buffering and/or downlink data notification triggering.

In an example, an AMF may host functions such as NAS signaling termination, NAS signaling security, Access Stratum (AS) security control, inter Core Network (CN) node signaling for mobility between 3^(rd) Generation Partnership Project (3GPP) access networks, idle mode UE reachability (e.g., control and execution of paging retransmission), registration area management, support of intra-system and inter-system mobility, access authentication, access authorization including check of roaming rights, mobility management control (subscription and policies), support of network slicing and/or Session Management Function (SMF) selection.

FIG. 2A is an example user plane protocol stack, where Service Data Adaptation Protocol (SDAP) (e.g. 211 and 221), Packet Data Convergence Protocol (PDCP) (e.g. 212 and 222), Radio Link Control (RLC) (e.g. 213 and 223) and Media Access Control (MAC) (e.g. 214 and 224) sublayers and Physical (PHY) (e.g. 215 and 225) layer may be terminated in wireless device (e.g. 110) and gNB (e.g. 120) on the network side. In an example, a PHY layer provides transport services to higher layers (e.g. MAC, RRC, etc). In an example, services and functions of a MAC sublayer may comprise mapping between logical channels and transport channels, multiplexing/demultiplexing of MAC Service Data Units (SDUs) belonging to one or different logical channels into/from Transport Blocks (TBs) delivered to/from the PHY layer, scheduling information reporting, error correction through Hybrid Automatic Repeat request (HARQ) (e.g. one HARQ entity per carrier in case of Carrier Aggregation (CA)), priority handling between UEs by means of dynamic scheduling, priority handling between logical channels of one UE by means of logical channel prioritization, and/or padding. A MAC entity may support one or multiple numerologies and/or transmission timings. In an example, mapping restrictions in a logical channel prioritization may control which numerology and/or transmission timing a logical channel may use. In an example, an RLC sublayer may supports transparent mode (TM), unacknowledged mode (UM) and acknowledged mode (AM) transmission modes. The RLC configuration may be per logical channel with no dependency on numerologies and/or Transmission Time Interval (TTI) durations. In an example, Automatic Repeat Request (ARQ) may operate on any of the numerologies and/or TTI durations the logical channel is configured with. In an example, services and functions of the PDCP layer for the user plane may comprise sequence numbering, header compression and decompression, transfer of user data, reordering and duplicate detection, PDCP PDU routing (e.g. in case of split bearers), retransmission of PDCP SDUs, ciphering, deciphering and integrity protection, PDCP SDU discard, PDCP re-establishment and data recovery for RLC AM, and/or duplication of PDCP PDUs. In an example, services and functions of SDAP may comprise mapping between a QoS flow and a data radio bearer. In an example, services and functions of SDAP may comprise mapping Quality of Service Indicator (QFI) in DL and UL packets. In an example, a protocol entity of SDAP may be configured for an individual PDU session.

FIG. 2B is an example control plane protocol stack where PDCP (e.g. 233 and 242), RLC (e.g. 234 and 243) and MAC (e.g. 235 and 244) sublayers and PHY (e.g. 236 and 245) layer may be terminated in wireless device (e.g. 110) and gNB (e.g. 120) on a network side and perform service and functions described above. In an example, RRC (e.g. 232 and 241) may be terminated in a wireless device and a gNB on a network side. In an example, services and functions of RRC may comprise broadcast of system information related to AS and NAS, paging initiated by 5GC or RAN, establishment, maintenance and release of an RRC connection between the UE and RAN, security functions including key management, establishment, configuration, maintenance and release of Signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs), mobility functions, QoS management functions, UE measurement reporting and control of the reporting, detection of and recovery from radio link failure, and/or NAS message transfer to/from NAS from/to a UE. In an example, NAS control protocol (e.g. 231 and 251) may be terminated in the wireless device and AMF (e.g. 130) on a network side and may perform functions such as authentication, mobility management between a UE and a AMF for 3GPP access and non-3GPP access, and session management between a UE and a SMF for 3GPP access and non-3GPP access.

In an example, a base station may configure a plurality of logical channels for a wireless device. A logical channel in the plurality of logical channels may correspond to a radio bearer and the radio bearer may be associated with a QoS requirement. In an example, a base station may configure a logical channel to be mapped to one or more TTIs/numerologies in a plurality of TTIs/numerologies. The wireless device may receive a Downlink Control Information (DCI) via Physical Downlink Control CHannel (PDCCH) indicating an uplink grant. In an example, the uplink grant may be for a first TTI/numerology and may indicate uplink resources for transmission of a transport block. The base station may configure each logical channel in the plurality of logical channels with one or more parameters to be used by a logical channel prioritization procedure at the MAC layer of the wireless device. The one or more parameters may comprise priority, prioritized bit rate, etc. A logical channel in the plurality of logical channels may correspond to one or more buffers comprising data associated with the logical channel. The logical channel prioritization procedure may allocate the uplink resources to one or more first logical channels in the plurality of logical channels and/or one or more MAC Control Elements (CEs). The one or more first logical channels may be mapped to the first TTI/numerology. The MAC layer at the wireless device may multiplex one or more MAC CEs and/or one or more MAC SDUs (e.g., logical channel) in a MAC PDU (e.g., transport block). In an example, the MAC PDU may comprise a MAC header comprising a plurality of MAC sub-headers. A MAC sub-header in the plurality of MAC sub-headers may correspond to a MAC CE or a MAC SUD (logical channel) in the one or more MAC CEs and/or one or more MAC SDUs. In an example, a MAC CE or a logical channel may be configured with a Logical Channel IDentifier (LCID). In an example, LCID for a logical channel or a MAC CE may be fixed/pre-configured. In an example, LCID for a logical channel or MAC CE may be configured for the wireless device by the base station. The MAC sub-header corresponding to a MAC CE or a MAC SDU may comprise LCID associated with the MAC CE or the MAC SDU.

In an example, a base station may activate and/or deactivate and/or impact one or more processes (e.g., set values of one or more parameters of the one or more processes or start and/or stop one or more timers of the one or more processes) at the wireless device by employing one or more MAC commands. The one or more MAC commands may comprise one or more MAC control elements. In an example, the one or more processes may comprise activation and/or deactivation of PDCP packet duplication for one or more radio bearers. The base station may transmit a MAC CE comprising one or more fields, the values of the fields indicating activation and/or deactivation of PDCP duplication for the one or more radio bearers. In an example, the one or more processes may comprise Channel State Information (CSI) transmission of on one or more cells. The base station may transmit one or more MAC CEs indicating activation and/or deactivation of the CSI transmission on the one or more cells. In an example, the one or more processes may comprise activation or deactivation of one or more secondary cells. In an example, the base station may transmit a MA CE indicating activation or deactivation of one or more secondary cells. In an example, the base station may transmit one or more MAC CEs indicating starting and/or stopping one or more Discontinuous Reception (DRX) timers at the wireless device. In an example, the base station may transmit one or more MAC CEs indicating one or more timing advance values for one or more Timing Advance Groups (TAGs).

FIG. 3 is a block diagram of base stations (base station 1, 120A, and base station 2, 120B) and a wireless device 110. A wireless device may be called an UE. A base station may be called a NB, eNB, gNB, and/or ng-eNB. In an example, a wireless device and/or a base station may act as a relay node. The base station 1, 120A, may comprise at least one communication interface 320A (e.g. a wireless modem, an antenna, a wired modem, and/or the like), at least one processor 321A, and at least one set of program code instructions 323A stored in non-transitory memory 322A and executable by the at least one processor 321A. The base station 2, 120B, may comprise at least one communication interface 320B, at least one processor 321B, and at least one set of program code instructions 323B stored in non-transitory memory 322B and executable by the at least one processor 321B.

A base station may comprise many sectors for example: 1, 2, 3, 4, or 6 sectors. A base station may comprise many cells, for example, ranging from 1 to 50 cells or more. A cell may be categorized, for example, as a primary cell or secondary cell. At Radio Resource Control (RRC) connection establishment/re-establishment/handover, one serving cell may provide the NAS (non-access stratum) mobility information (e.g. Tracking Area Identifier (TAI)). At RRC connection re-establishment/handover, one serving cell may provide the security input. This cell may be referred to as the Primary Cell (PCell). In the downlink, a carrier corresponding to the PCell may be a DL Primary Component Carrier (PCC), while in the uplink, a carrier may be an UL PCC. Depending on wireless device capabilities, Secondary Cells (SCells) may be configured to form together with a PCell a set of serving cells. In a downlink, a carrier corresponding to an SCell may be a downlink secondary component carrier (DL SCC), while in an uplink, a carrier may be an uplink secondary component carrier (UL SCC). An SCell may or may not have an uplink carrier.

A cell, comprising a downlink carrier and optionally an uplink carrier, may be assigned a physical cell ID and a cell index. A carrier (downlink or uplink) may belong to one cell. The cell ID or cell index may also identify the downlink carrier or uplink carrier of the cell (depending on the context it is used). In the disclosure, a cell ID may be equally referred to a carrier ID, and a cell index may be referred to a carrier index. In an implementation, a physical cell ID or a cell index may be assigned to a cell. A cell ID may be determined using a synchronization signal transmitted on a downlink carrier. A cell index may be determined using RRC messages. For example, when the disclosure refers to a first physical cell ID for a first downlink carrier, the disclosure may mean the first physical cell ID is for a cell comprising the first downlink carrier. The same concept may apply to, for example, carrier activation. When the disclosure indicates that a first carrier is activated, the specification may equally mean that a cell comprising the first carrier is activated.

A base station may transmit to a wireless device one or more messages (e.g. RRC messages) comprising a plurality of configuration parameters for one or more cells. One or more cells may comprise at least one primary cell and at least one secondary cell. In an example, an RRC message may be broadcasted or unicasted to the wireless device. In an example, configuration parameters may comprise common parameters and dedicated parameters.

Services and/or functions of an RRC sublayer may comprise at least one of: broadcast of system information related to AS and NAS; paging initiated by 5GC and/or NG-RAN; establishment, maintenance, and/or release of an RRC connection between a wireless device and NG-RAN, which may comprise at least one of addition, modification and release of carrier aggregation; or addition, modification, and/or release of dual connectivity in NR or between E-UTRA and NR. Services and/or functions of an RRC sublayer may further comprise at least one of security functions comprising key management; establishment, configuration, maintenance, and/or release of Signaling Radio Bearers (SRBs) and/or Data Radio Bearers (DRBs); mobility functions which may comprise at least one of a handover (e.g. intra NR mobility or inter-RAT mobility) and a context transfer; or a wireless device cell selection and reselection and control of cell selection and reselection. Services and/or functions of an RRC sublayer may further comprise at least one of QoS management functions; a wireless device measurement configuration/reporting; detection of and/or recovery from radio link failure; or NAS message transfer to/from a core network entity (e.g. AMF, Mobility Management Entity (MME)) from/to the wireless device.

An RRC sublayer may support an RRC_Idle state, an RRC_Inactive state and/or an RRC_Connected state for a wireless device. In an RRC_Idle state, a wireless device may perform at least one of: Public Land Mobile Network (PLMN) selection; receiving broadcasted system information; cell selection/re-selection; monitoring/receiving a paging for mobile terminated data initiated by 5GC; paging for mobile terminated data area managed by 5GC; or DRX for CN paging configured via NAS. In an RRC_Inactive state, a wireless device may perform at least one of: receiving broadcasted system information; cell selection/re-selection; monitoring/receiving a RAN/CN paging initiated by NG-RAN/5GC; RAN-based notification area (RNA) managed by NG-RAN; or DRX for RAN/CN paging configured by NG-RAN/NAS. In an RRC_Idle state of a wireless device, a base station (e.g. NG-RAN) may keep a 5GC-NG-RAN connection (both C/U-planes) for the wireless device; and/or store a UE AS context for the wireless device. In an RRC_Connected state of a wireless device, a base station (e.g. NG-RAN) may perform at least one of: establishment of 5GC-NG-RAN connection (both C/U-planes) for the wireless device; storing a UE AS context for the wireless device; transmit/receive of unicast data to/from the wireless device; or network-controlled mobility based on measurement results received from the wireless device. In an RRC_Connected state of a wireless device, an NG-RAN may know a cell that the wireless device belongs to.

System information (SI) may be divided into minimum SI and other SI. The minimum SI may be periodically broadcast. The minimum SI may comprise basic information required for initial access and information for acquiring any other SI broadcast periodically or provisioned on-demand, i.e. scheduling information. The other SI may either be broadcast, or be provisioned in a dedicated manner, either triggered by a network or upon request from a wireless device. A minimum SI may be transmitted via two different downlink channels using different messages (e.g. MasterInforrnationBlock and SysternInforrnationBlockType1). An other SI may be transmitted via SystemInformationBlockType2. For a wireless device in an RRC_Connected state, dedicated RRC signalling may be employed for the request and delivery of the other SI. For the wireless device in the RRC_Idle state and/or the RRC_Inactive state, the request may trigger a random-access procedure.

A wireless device may report its radio access capability information which may be static. A base station may request what capabilities for a wireless device to report based on band information. When allowed by a network, a temporary capability restriction request may be sent by the wireless device to signal the limited availability of some capabilities (e.g. due to hardware sharing, interference or overheating) to the base station. The base station may confirm or reject the request. The temporary capability restriction may be transparent to 5GC (e.g., only static capabilities may be stored in 5GC).

When CA is configured, a wireless device may have an RRC connection with a network. At RRC connection establishment/re-establishment/handover procedure, one serving cell may provide NAS mobility information, and at RRC connection re-establishment/handover, one serving cell may provide a security input. This cell may be referred to as the PCell. Depending on the capabilities of the wireless device, SCells may be configured to form together with the PCell a set of serving cells. The configured set of serving cells for the wireless device may comprise one PCell and one or more SCells.

The reconfiguration, addition and removal of SCells may be performed by RRC. At intra-NR handover, RRC may also add, remove, or reconfigure SCells for usage with the target PCell. When adding a new SCell, dedicated RRC signalling may be employed to send all required system information of the SCell i.e. while in connected mode, wireless devices may not need to acquire broadcasted system information directly from the SCells.

The purpose of an RRC connection reconfiguration procedure may be to modify an RRC connection, (e.g. to establish, modify and/or release RBs, to perform handover, to setup, modify, and/or release measurements, to add, modify, and/or release SCells and cell groups). As part of the RRC connection reconfiguration procedure, NAS dedicated information may be transferred from the network to the wireless device. The RRCConnectionReconfiguration message may be a command to modify an RRC connection. It may convey information for measurement configuration, mobility control, radio resource configuration (e.g. RBs, MAC main configuration and physical channel configuration) comprising any associated dedicated NAS information and security configuration. If the received RRC Connection Reconfiguration message includes the sCellToReleaseList, the wireless device may perform an SCell release. If the received RRC Connection Reconfiguration message includes the sCellToAddModList, the wireless device may perform SCell additions or modification.

An RRC connection establishment (or reestablishment, resume) procedure may be to establish (or reestablish, resume) an RRC connection. an RRC connection establishment procedure may comprise SRB1 establishment. The RRC connection establishment procedure may be used to transfer the initial NAS dedicated information/message from a wireless device to E-UTRAN. The RRCConnectionReestablishment message may be used to re-establish SRB1.

A measurement report procedure may be to transfer measurement results from a wireless device to NG-RAN. The wireless device may initiate a measurement report procedure after successful security activation. A measurement report message may be employed to transmit measurement results.

The wireless device 110 may comprise at least one communication interface 310 (e.g. a wireless modem, an antenna, and/or the like), at least one processor 314, and at least one set of program code instructions 316 stored in non-transitory memory 315 and executable by the at least one processor 314. The wireless device 110 may further comprise at least one of at least one speaker/microphone 311, at least one keypad 312, at least one display/touchpad 313, at least one power source 317, at least one global positioning system (GPS) chipset 318, and other peripherals 319.

The processor 314 of the wireless device 110, the processor 321A of the base station 1 120A, and/or the processor 321B of the base station 2 120B may comprise at least one of a general-purpose processor, a digital signal processor (DSP), a controller, a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) and/or other programmable logic device, discrete gate and/or transistor logic, discrete hardware components, and the like. The processor 314 of the wireless device 110, the processor 321A in base station 1 120A, and/or the processor 321B in base station 2 120B may perform at least one of signal coding/processing, data processing, power control, input/output processing, and/or any other functionality that may enable the wireless device 110, the base station 1 120A and/or the base station 2 120B to operate in a wireless environment.

The processor 314 of the wireless device 110 may be connected to the speaker/microphone 311, the keypad 312, and/or the display/touchpad 313. The processor 314 may receive user input data from and/or provide user output data to the speaker/microphone 311, the keypad 312, and/or the display/touchpad 313. The processor 314 in the wireless device 110 may receive power from the power source 317 and/or may be configured to distribute the power to the other components in the wireless device 110. The power source 317 may comprise at least one of one or more dry cell batteries, solar cells, fuel cells, and the like. The processor 314 may be connected to the GPS chipset 318. The GPS chipset 318 may be configured to provide geographic location information of the wireless device 110.

The processor 314 of the wireless device 110 may further be connected to other peripherals 319, which may comprise one or more software and/or hardware modules that provide additional features and/or functionalities. For example, the peripherals 319 may comprise at least one of an accelerometer, a satellite transceiver, a digital camera, a universal serial bus (USB) port, a hands-free headset, a frequency modulated (FM) radio unit, a media player, an Internet browser, and the like.

The communication interface 320A of the base station 1, 120A, and/or the communication interface 320B of the base station 2, 120B, may be configured to communicate with the communication interface 310 of the wireless device 110 via a wireless link 330A and/or a wireless link 330B respectively. In an example, the communication interface 320A of the base station 1, 120A, may communicate with the communication interface 320B of the base station 2 and other RAN and core network nodes.

The wireless link 330A and/or the wireless link 330B may comprise at least one of a bi-directional link and/or a directional link. The communication interface 310 of the wireless device 110 may be configured to communicate with the communication interface 320A of the base station 1 120A and/or with the communication interface 320B of the base station 2 120B. The base station 1 120A and the wireless device 110 and/or the base station 2 120B and the wireless device 110 may be configured to send and receive transport blocks via the wireless link 330A and/or via the wireless link 330B, respectively. The wireless link 330A and/or the wireless link 330B may employ at least one frequency carrier. According to some of various aspects of embodiments, transceiver(s) may be employed. A transceiver may be a device that comprises both a transmitter and a receiver. Transceivers may be employed in devices such as wireless devices, base stations, relay nodes, and/or the like. Example embodiments for radio technology implemented in the communication interface 310, 320A, 320B and the wireless link 330A, 330B are illustrated in FIG. 4A, FIG. 4B, FIG. 4C, FIG. 4D, FIG. 6, FIG. 7A, FIG. 7B, FIG. 8, and associated text.

In an example, other nodes in a wireless network (e.g. AMF, UPF, SMF, etc) may comprise one or more communication interfaces, one or more processors, and memory storing instructions.

A node (e.g. wireless device, base station, AMF, SMF, UPF, servers, switches, antennas, and/or the like) may comprise one or more processors, and memory storing instructions that when executed by the one or more processors causes the node to perform certain processes and/or functions. Example embodiments may enable operation of single-carrier and/or multi-carrier communications. Other example embodiments may comprise a non-transitory tangible computer readable media comprising instructions executable by one or more processors to cause operation of single-carrier and/or multi-carrier communications. Yet other example embodiments may comprise an article of manufacture that comprises a non-transitory tangible computer readable machine-accessible medium having instructions encoded thereon for enabling programmable hardware to cause a node to enable operation of single-carrier and/or multi-carrier communications. The node may include processors, memory, interfaces, and/or the like.

An interface may comprise at least one of a hardware interface, a firmware interface, a software interface, and/or a combination thereof. The hardware interface may comprise connectors, wires, electronic devices such as drivers, amplifiers, and/or the like. The software interface may comprise code stored in a memory device to implement protocol(s), protocol layers, communication drivers, device drivers, combinations thereof, and/or the like. The firmware interface may comprise a combination of embedded hardware and code stored in and/or in communication with a memory device to implement connections, electronic device operations, protocol(s), protocol layers, communication drivers, device drivers, hardware operations, combinations thereof, and/or the like.

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplink and downlink signal transmission as per an aspect of an embodiment of the present disclosure. FIG. 4A shows an example uplink transmitter for at least one physical channel. A baseband signal representing a physical uplink shared channel may perform one or more functions. The one or more functions may comprise at least one of: scrambling; modulation of scrambled bits to generate complex-valued symbols; mapping of the complex-valued modulation symbols onto one or several transmission layers; transform precoding to generate complex-valued symbols; precoding of the complex-valued symbols; mapping of precoded complex-valued symbols to resource elements; generation of complex-valued time-domain Single Carrier-Frequency Division Multiple Access (SC-FDMA) or CP-OFDM signal for an antenna port; and/or the like. In an example, when transform precoding is enabled, a SC-FDMA signal for uplink transmission may be generated. In an example, when transform precoding is not enabled, an CP-OFDM signal for uplink transmission may be generated by FIG. 4A. These functions are illustrated as examples and it is anticipated that other mechanisms may be implemented in various embodiments.

An example structure for modulation and up-conversion to the carrier frequency of the complex-valued SC-FDMA or CP-OFDM baseband signal for an antenna port and/or the complex-valued Physical Random Access CHannel (PRACH) baseband signal is shown in FIG. 4B. Filtering may be employed prior to transmission.

An example structure for downlink transmissions is shown in FIG. 4C. The baseband signal representing a downlink physical channel may perform one or more functions. The one or more functions may comprise: scrambling of coded bits in a codeword to be transmitted on a physical channel; modulation of scrambled bits to generate complex-valued modulation symbols; mapping of the complex-valued modulation symbols onto one or several transmission layers; precoding of the complex-valued modulation symbols on a layer for transmission on the antenna ports; mapping of complex-valued modulation symbols for an antenna port to resource elements; generation of complex-valued time-domain OFDM signal for an antenna port; and/or the like. These functions are illustrated as examples and it is anticipated that other mechanisms may be implemented in various embodiments.

In an example, a gNB may transmit a first symbol and a second symbol on an antenna port, to a wireless device. The wireless device may infer the channel (e.g., fading gain, multipath delay, etc.) for conveying the second symbol on the antenna port, from the channel for conveying the first symbol on the antenna port. In an example, a first antenna port and a second antenna port may be quasi co-located if one or more large-scale properties of the channel over which a first symbol on the first antenna port is conveyed may be inferred from the channel over which a second symbol on a second antenna port is conveyed. The one or more large-scale properties may comprise at least one of: delay spread; doppler spread; doppler shift; average gain; average delay; and/or spatial Receiving (Rx) parameters.

An example modulation and up-conversion to the carrier frequency of the complex-valued OFDM baseband signal for an antenna port is shown in FIG. 4D. Filtering may be employed prior to transmission.

FIG. 5A is a diagram of an example uplink channel mapping and example uplink physical signals. FIG. 5B is a diagram of an example downlink channel mapping and a downlink physical signals. In an example, a physical layer may provide one or more information transfer services to a MAC and/or one or more higher layers. For example, the physical layer may provide the one or more information transfer services to the MAC via one or more transport channels. An information transfer service may indicate how and with what characteristics data are transferred over the radio interface.

In an example embodiment, a radio network may comprise one or more downlink and/or uplink transport channels. For example, a diagram in FIG. 5A shows example uplink transport channels comprising Uplink-Shared CHannel (UL-SCH) 501 and Random Access CHannel (RACH) 502. A diagram in FIG. 5B shows example downlink transport channels comprising Downlink-Shared CHannel (DL-SCH) 511, Paging CHannel (PCH) 512, and Broadcast CHannel (BCH) 513. A transport channel may be mapped to one or more corresponding physical channels. For example, UL-SCH 501 may be mapped to Physical Uplink Shared CHannel (PUSCH) 503. RACH 502 may be mapped to PRACH 505. DL-SCH 511 and PCH 512 may be mapped to Physical Downlink Shared CHannel (PDSCH) 514. BCH 513 may be mapped to Physical Broadcast CHannel (PBCH) 516.

There may be one or more physical channels without a corresponding transport channel. The one or more physical channels may be employed for Uplink Control Information (UCI) 509 and/or Downlink Control Information (DCI) 517. For example, Physical Uplink Control CHannel (PUCCH) 504 may carry UCI 509 from a UE to a base station. For example, Physical Downlink Control CHannel (PDCCH) 515 may carry DCI 517 from a base station to a UE. NR may support UCI 509 multiplexing in PUSCH 503 when UCI 509 and PUSCH 503 transmissions may coincide in a slot at least in part. The UCI 509 may comprise at least one of CSI, Acknowledgement (ACK)/Negative Acknowledgement (NACK), and/or scheduling request. The DCI 517 on PDCCH 515 may indicate at least one of following: one or more downlink assignments and/or one or more uplink scheduling grants

In uplink, a UE may transmit one or more Reference Signals (RSs) to a base station. For example, the one or more RSs may be at least one of Demodulation-RS (DM-RS) 506, Phase Tracking-RS (PT-RS) 507, and/or Sounding RS (SRS) 508. In downlink, a base station may transmit (e.g., unicast, multicast, and/or broadcast) one or more RSs to a UE. For example, the one or more RSs may be at least one of Primary Synchronization Signal (PSS)/Secondary Synchronization Signal (SSS) 521, CSI-RS 522, DM-RS 523, and/or PT-RS 524.

In an example, a UE may transmit one or more uplink DM-RSs 506 to a base station for channel estimation, for example, for coherent demodulation of one or more uplink physical channels (e.g., PUSCH 503 and/or PUCCH 504). For example, a UE may transmit a base station at least one uplink DM-RS 506 with PUSCH 503 and/or PUCCH 504, wherein the at least one uplink DM-RS 506 may be spanning a same frequency range as a corresponding physical channel. In an example, a base station may configure a UE with one or more uplink DM-RS configurations. At least one DM-RS configuration may support a front-loaded DM-RS pattern. A front-loaded DM-RS may be mapped over one or more OFDM symbols (e.g., 1 or 2 adjacent OFDM symbols). One or more additional uplink DM-RS may be configured to transmit at one or more symbols of a PUSCH and/or PUCCH. A base station may semi-statistically configure a UE with a maximum number of front-loaded DM-RS symbols for PUSCH and/or PUCCH. For example, a UE may schedule a single-symbol DM-RS and/or double symbol DM-RS based on a maximum number of front-loaded DM-RS symbols, wherein a base station may configure the UE with one or more additional uplink DM-RS for PUSCH and/or PUCCH. A new radio network may support, e.g., at least for CP-OFDM, a common DM-RS structure for DL and UL, wherein a DM-RS location, DM-RS pattern, and/or scrambling sequence may be same or different.

In an example, whether uplink PT-RS 507 is present or not may depend on a RRC configuration. For example, a presence of uplink PT-RS may be UE-specifically configured. For example, a presence and/or a pattern of uplink PT-RS 507 in a scheduled resource may be UE-specifically configured by a combination of RRC signaling and/or association with one or more parameters employed for other purposes (e.g., Modulation and Coding Scheme (MCS)) which may be indicated by DCI. When configured, a dynamic presence of uplink PT-RS 507 may be associated with one or more DCI parameters comprising at least MCS. A radio network may support plurality of uplink PT-RS densities defined in time/frequency domain. When present, a frequency domain density may be associated with at least one configuration of a scheduled bandwidth. A UE may assume a same precoding for a DMRS port and a PT-RS port. A number of PT-RS ports may be fewer than a number of DM-RS ports in a scheduled resource. For example, uplink PT-RS 507 may be confined in the scheduled time/frequency duration for a UE.

In an example, a UE may transmit SRS 508 to a base station for channel state estimation to support uplink channel dependent scheduling and/or link adaptation. For example, SRS 508 transmitted by a UE may allow for a base station to estimate an uplink channel state at one or more different frequencies. A base station scheduler may employ an uplink channel state to assign one or more resource blocks of good quality for an uplink PUSCH transmission from a UE. A base station may semi-statistically configure a UE with one or more SRS resource sets. For an SRS resource set, a base station may configure a UE with one or more SRS resources. An SRS resource set applicability may be configured by a higher layer (e.g., RRC) parameter. For example, when a higher layer parameter indicates beam management, a SRS resource in each of one or more SRS resource sets may be transmitted at a time instant. A UE may transmit one or more SRS resources in different SRS resource sets simultaneously. A new radio network may support aperiodic, periodic and/or semi-persistent SRS transmissions. A UE may transmit SRS resources based on one or more trigger types, wherein the one or more trigger types may comprise higher layer signaling (e.g., RRC) and/or one or more DCI formats (e.g., at least one DCI format may be employed for a UE to select at least one of one or more configured SRS resource sets. An SRS trigger type 0 may refer to an SRS triggered based on a higher layer signaling. An SRS trigger type 1 may refer to an SRS triggered based on one or more DCI formats. In an example, when PUSCH 503 and SRS 508 are transmitted in a same slot, a UE may be configured to transmit SRS 508 after a transmission of PUSCH 503 and corresponding uplink DM-RS 506.

In an example, a base station may semi-statistically configure a UE with one or more SRS configuration parameters indicating at least one of following: a SRS resource configuration identifier, a number of SRS ports, time domain behavior of SRS resource configuration (e.g., an indication of periodic, semi-persistent, or aperiodic SRS), slot (mini-slot, and/or subframe) level periodicity and/or offset for a periodic and/or aperiodic SRS resource, a number of OFDM symbols in a SRS resource, starting OFDM symbol of a SRS resource, a SRS bandwidth, a frequency hopping bandwidth, a cyclic shift, and/or a SRS sequence ID.

In an example, in a time domain, an SS/PBCH block may comprise one or more OFDM symbols (e.g., 4 OFDM symbols numbered in increasing order from 0 to 3) within the SS/PBCH block. An SS/PBCH block may comprise PSS/SSS 521 and PBCH 516. In an example, in the frequency domain, an SS/PBCH block may comprise one or more contiguous subcarriers (e.g., 240 contiguous subcarriers with the subcarriers numbered in increasing order from 0 to 239) within the SS/PBCH block. For example, a PSS/SSS 521 may occupy 1 OFDM symbol and 127 subcarriers. For example, PBCH 516 may span across 3 OFDM symbols and 240 subcarriers. A UE may assume that one or more SS/PBCH blocks transmitted with a same block index may be quasi co-located, e.g., with respect to Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. A UE may not assume quasi co-location for other SS/PBCH block transmissions. A periodicity of an SS/PBCH block may be configured by a radio network (e.g., by an RRC signaling) and one or more time locations where the SS/PBCH block may be sent may be determined by sub-carrier spacing. In an example, a UE may assume a band-specific sub-carrier spacing for an SS/PBCH block unless a radio network has configured a UE to assume a different sub-carrier spacing.

In an example, downlink CSI-RS 522 may be employed for a UE to acquire channel state information. A radio network may support periodic, aperiodic, and/or semi-persistent transmission of downlink CSI-RS 522. For example, a base station may semi-statistically configure and/or reconfigure a UE with periodic transmission of downlink CSI-RS 522. A configured CSI-RS resources may be activated ad/or deactivated. For semi-persistent transmission, an activation and/or deactivation of CSI-RS resource may be triggered dynamically. In an example, CSI-RS configuration may comprise one or more parameters indicating at least a number of antenna ports. For example, a base station may configure a UE with 32 ports. A base station may semi-statistically configure a UE with one or more CSI-RS resource sets. One or more CSI-RS resources may be allocated from one or more CSI-RS resource sets to one or more UEs. For example, a base station may semi-statistically configure one or more parameters indicating CSI RS resource mapping, for example, time-domain location of one or more CSI-RS resources, a bandwidth of a CSI-RS resource, and/or a periodicity. In an example, a UE may be configured to employ a same OFDM symbols for downlink CSI-RS 522 and Control Resource Set (CORESET) when the downlink CSI-RS 522 and CORESET are spatially quasi co-located and resource elements associated with the downlink CSI-RS 522 are the outside of PRBs configured for CORESET. In an example, a UE may be configured to employ a same OFDM symbols for downlink CSI-RS 522 and SSB/PBCH when the downlink CSI-RS 522 and SSB/PBCH are spatially quasi co-located and resource elements associated with the downlink CSI-RS 522 are the outside of PRBs configured for SSB/PBCH.

In an example, a UE may transmit one or more downlink DM-RSs 523 to a base station for channel estimation, for example, for coherent demodulation of one or more downlink physical channels (e.g., PDSCH 514). For example, a radio network may support one or more variable and/or configurable DM-RS patterns for data demodulation. At least one downlink DM-RS configuration may support a front-loaded DM-RS pattern. A front-loaded DM-RS may be mapped over one or more OFDM symbols (e.g., 1 or 2 adjacent OFDM symbols). A base station may semi-statistically configure a UE with a maximum number of front-loaded DM-RS symbols for PDSCH 514. For example, a DM-RS configuration may support one or more DM-RS ports. For example, for single user-MIMO, a DM-RS configuration may support at least 8 orthogonal downlink DM-RS ports. For example, for multiuser-MIMO, a DM-RS configuration may support 12 orthogonal downlink DM-RS ports. A radio network may support, e.g., at least for CP-OFDM, a common DM-RS structure for DL and UL, wherein a DM-RS location, DM-RS pattern, and/or scrambling sequence may be same or different.

In an example, whether downlink PT-RS 524 is present or not may depend on a RRC configuration. For example, a presence of downlink PT-RS 524 may be UE-specifically configured. For example, a presence and/or a pattern of downlink PT-RS 524 in a scheduled resource may be UE-specifically configured by a combination of RRC signaling and/or association with one or more parameters employed for other purposes (e.g., MCS) which may be indicated by DCI. When configured, a dynamic presence of downlink PT-RS 524 may be associated with one or more DCI parameters comprising at least MCS. A radio network may support plurality of PT-RS densities defined in time/frequency domain. When present, a frequency domain density may be associated with at least one configuration of a scheduled bandwidth. A UE may assume a same precoding for a DMRS port and a PT-RS port. A number of PT-RS ports may be fewer than a number of DM-RS ports in a scheduled resource. For example, downlink PT-RS 524 may be confined in the scheduled time/frequency duration for a UE.

FIG. 6 is a diagram depicting an example transmission time and reception time for a carrier as per an aspect of an embodiment of the present disclosure. A multicarrier OFDM communication system may include one or more carriers, for example, ranging from 1 to 32 carriers, in case of carrier aggregation, or ranging from 1 to 64 carriers, in case of dual connectivity. Different radio frame structures may be supported (e.g., for FDD and for TDD duplex mechanisms). FIG. 6 shows an example frame timing. Downlink and uplink transmissions may be organized into radio frames 601. In this example, radio frame duration is 10 ms. In this example, a 10 ms radio frame 601 may be divided into ten equally sized subframes 602 with 1 ms duration. Subframe(s) may comprise one or more slots (e.g. slots 603 and 605) depending on subcarrier spacing and/or CP length. For example, a subframe with 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz and 480 kHz subcarrier spacing may comprise one, two, four, eight, sixteen and thirty-two slots, respectively. In FIG. 6, a subframe may be divided into two equally sized slots 603 with 0.5 ms duration. For example, 10 subframes may be available for downlink transmission and 10 subframes may be available for uplink transmissions in a 10 ms interval. Uplink and downlink transmissions may be separated in the frequency domain. Slot(s) may include a plurality of OFDM symbols 604. The number of OFDM symbols 604 in a slot 605 may depend on the cyclic prefix length. For example, a slot may be 14 OFDM symbols for the same subcarrier spacing of up to 480 kHz with normal CP. A slot may be 12 OFDM symbols for the same subcarrier spacing of 60 kHz with extended CP. A slot may contain downlink, uplink, or a downlink part and an uplink part and/or alike.

FIG. 7A is a diagram depicting example sets of OFDM subcarriers as per an aspect of an embodiment of the present disclosure. In the example, a gNB may communicate with a wireless device with a carrier with an example channel bandwidth 700. Arrow(s) in the diagram may depict a subcarrier in a multicarrier OFDM system. The OFDM system may use technology such as OFDM technology, SC-FDMA technology, and/or the like. In an example, an arrow 701 shows a subcarrier transmitting information symbols. In an example, a subcarrier spacing 702, between two contiguous subcarriers in a carrier, may be any one of 15 KHz, 30 KHz, 60 KHz, 120 KHz, 240 KHz etc. In an example, different subcarrier spacing may correspond to different transmission numerologies. In an example, a transmission numerology may comprise at least: a numerology index; a value of subcarrier spacing; a type of cyclic prefix (CP). In an example, a gNB may transmit to/receive from a UE on a number of subcarriers 703 in a carrier. In an example, a bandwidth occupied by a number of subcarriers 703 (transmission bandwidth) may be smaller than the channel bandwidth 700 of a carrier, due to guard band 704 and 705. In an example, a guard band 704 and 705 may be used to reduce interference to and from one or more neighbor carriers. A number of subcarriers (transmission bandwidth) in a carrier may depend on the channel bandwidth of the carrier and the subcarrier spacing. For example, a transmission bandwidth, for a carrier with 20 MHz channel bandwidth and 15 KHz subcarrier spacing, may be in number of 1024 subcarriers.

In an example, a gNB and a wireless device may communicate with multiple CCs when configured with CA. In an example, different component carriers may have different bandwidth and/or subcarrier spacing, if CA is supported. In an example, a gNB may transmit a first type of service to a UE on a first component carrier. The gNB may transmit a second type of service to the UE on a second component carrier. Different type of services may have different service requirement (e.g., data rate, latency, reliability), which may be suitable for transmission via different component carrier having different subcarrier spacing and/or bandwidth. FIG. 7B shows an example embodiment. A first component carrier may comprise a first number of subcarriers 706 with a first subcarrier spacing 709. A second component carrier may comprise a second number of subcarriers 707 with a second subcarrier spacing 710. A third component carrier may comprise a third number of subcarriers 708 with a third subcarrier spacing 711. Carriers in a multicarrier OFDM communication system may be contiguous carriers, non-contiguous carriers, or a combination of both contiguous and non-contiguous carriers.

FIG. 8 is a diagram depicting OFDM radio resources as per an aspect of an embodiment of the present disclosure. In an example, a carrier may have a transmission bandwidth 801. In an example, a resource grid may be in a structure of frequency domain 802 and time domain 803. In an example, a resource grid may comprise a first number of OFDM symbols in a subframe and a second number of resource blocks, starting from a common resource block indicated by higher-layer signaling (e.g. RRC signaling), for a transmission numerology and a carrier. In an example, in a resource grid, a resource unit identified by a subcarrier index and a symbol index may be a resource element 805. In an example, a subframe may comprise a first number of OFDM symbols 807 depending on a numerology associated with a carrier. For example, when a subcarrier spacing of a numerology of a carrier is 15 KHz, a subframe may have 14 OFDM symbols for a carrier. When a subcarrier spacing of a numerology is 30 KHz, a subframe may have 28 OFDM symbols. When a subcarrier spacing of a numerology is 60 Khz, a subframe may have 56 OFDM symbols, etc. In an example, a second number of resource blocks comprised in a resource grid of a carrier may depend on a bandwidth and a numerology of the carrier.

As shown in FIG. 8, a resource block 806 may comprise 12 subcarriers. In an example, multiple resource blocks may be grouped into a Resource Block Group (RBG) 804. In an example, a size of a RBG may depend on at least one of: a RRC message indicating a RBG size configuration; a size of a carrier bandwidth; or a size of a bandwidth part of a carrier. In an example, a carrier may comprise multiple bandwidth parts. A first bandwidth part of a carrier may have different frequency location and/or bandwidth from a second bandwidth part of the carrier.

In an example, a gNB may transmit a downlink control information comprising a downlink or uplink resource block assignment to a wireless device. A base station may transmit to or receive from, a wireless device, data packets (e.g. transport blocks) scheduled and transmitted via one or more resource blocks and one or more slots according to parameters in a downlink control information and/or RRC message(s). In an example, a starting symbol relative to a first slot of the one or more slots may be indicated to the wireless device. In an example, a gNB may transmit to or receive from, a wireless device, data packets scheduled on one or more RBGs and one or more slots.

In an example, a gNB may transmit a downlink control information comprising a downlink assignment to a wireless device via one or more PDCCHs. The downlink assignment may comprise parameters indicating at least modulation and coding format; resource allocation; and/or HARQ information related to DL-SCH. In an example, a resource allocation may comprise parameters of resource block allocation; and/or slot allocation. In an example, a gNB may dynamically allocate resources to a wireless device via a Cell-Radio Network Temporary Identifier (C-RNTI) on one or more PDCCHs. The wireless device may monitor the one or more PDCCHs in order to find possible allocation when its downlink reception is enabled. The wireless device may receive one or more downlink data package on one or more PDSCH scheduled by the one or more PDCCHs, when successfully detecting the one or more PDCCHs.

In an example, a gNB may allocate Configured Scheduling (CS) resources for down link transmission to a wireless device. The gNB may transmit one or more RRC messages indicating a periodicity of the CS grant. The gNB may transmit a DCI via a PDCCH addressed to a Configured Scheduling-RNTI (CS-RNTI) activating the CS resources. The DCI may comprise parameters indicating that the downlink grant is a CS grant. The CS grant may be implicitly reused according to the periodicity defined by the one or more RRC messages, until deactivated.

In an example, a gNB may transmit a downlink control information comprising an uplink grant to a wireless device via one or more PDCCHs. The uplink grant may comprise parameters indicating at least modulation and coding format; resource allocation; and/or HARQ information related to UL-SCH. In an example, a resource allocation may comprise parameters of resource block allocation; and/or slot allocation. In an example, a gNB may dynamically allocate resources to a wireless device via a C-RNTI on one or more PDCCHs. The wireless device may monitor the one or more PDCCHs in order to find possible resource allocation. The wireless device may transmit one or more uplink data package via one or more PUSCH scheduled by the one or more PDCCHs, when successfully detecting the one or more PDCCHs.

In an example, a gNB may allocate CS resources for uplink data transmission to a wireless device. The gNB may transmit one or more RRC messages indicating a periodicity of the CS grant. The gNB may transmit a DCI via a PDCCH addressed to a CS-RNTI activating the CS resources. The DCI may comprise parameters indicating that the uplink grant is a CS grant. The CS grant may be implicitly reused according to the periodicity defined by the one or more RRC message, until deactivated.

In an example, a base station may transmit DCI/control signaling via PDCCH. The DCI may take a format in a plurality of formats. A DCI may comprise downlink and/or uplink scheduling information (e.g., resource allocation information, HARQ related parameters, MCS), request for CSI (e.g., aperiodic CQI reports), request for SRS, uplink power control commands for one or more cells, one or more timing information (e.g., TB transmission/reception timing, HARQ feedback timing, etc.), etc. In an example, a DCI may indicate an uplink grant comprising transmission parameters for one or more transport blocks. In an example, a DCI may indicate downlink assignment indicating parameters for receiving one or more transport blocks. In an example, a DCI may be used by base station to initiate a contention-free random access at the wireless device. In an example, the base station may transmit a DCI comprising slot format indicator (SFI) notifying a slot format. In an example, the base station may transmit a DCI comprising pre-emption indication notifying the PRB(s) and/or OFDM symbol(s) where a UE may assume no transmission is intended for the UE. In an example, the base station may transmit a DCI for group power control of PUCCH or PUSCH or SRS. In an example, a DCI may correspond to an RNTI. In an example, the wireless device may obtain an RNTI in response to completing the initial access (e.g., C-RNTI). In an example, the base station may configure an RNTI for the wireless (e.g., CS-RNTI, TPC-CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, TPC-SRS-RNTI). In an example, the wireless device may compute an RNTI (e.g., the wireless device may compute RA-RNTI based on resources used for transmission of a preamble). In an example, an RNTI may have a pre-configured value (e.g., P-RNTI or SI-RNTI). In an example, a wireless device may monitor a group common search space which may be used by base station for transmitting DCIs that are intended for a group of UEs. In an example, a group common DCI may correspond to an RNTI which is commonly configured for a group of UEs. In an example, a wireless device may monitor a UE-specific search space. In an example, a UE specific DCI may correspond to an RNTI configured for the wireless device.

A NR system may support a single beam operation and/or a multi-beam operation. In a multi-beam operation, a base station may perform a downlink beam sweeping to provide coverage for common control channels and/or downlink SS blocks, which may comprise at least a PSS, a SSS, and/or PBCH. A wireless device may measure quality of a beam pair link using one or more RSs. One or more SS blocks, or one or more CSI-RS resources, associated with a CSI-RS resource index (CRI), or one or more DM-RSs of PBCH, may be used as RS for measuring quality of a beam pair link. Quality of a beam pair link may be defined as a reference signal received power (RSRP) value, or a reference signal received quality (RSRQ) value, and/or a CSI value measured on RS resources. The base station may indicate whether an RS resource, used for measuring a beam pair link quality, is quasi-co-located (QCLed) with DM-RSs of a control channel. A RS resource and DM-RSs of a control channel may be called QCLed when a channel characteristics from a transmission on an RS to a wireless device, and that from a transmission on a control channel to a wireless device, are similar or same under a configured criterion. In a multi-beam operation, a wireless device may perform an uplink beam sweeping to access a cell.

In an example, a wireless device may be configured to monitor PDCCH on one or more beam pair links simultaneously depending on a capability of a wireless device. This may increase robustness against beam pair link blocking. A base station may transmit one or more messages to configure a wireless device to monitor PDCCH on one or more beam pair links in different PDCCH OFDM symbols. For example, a base station may transmit higher layer signaling (e.g. RRC signaling) or MAC CE comprising parameters related to the Rx beam setting of a wireless device for monitoring PDCCH on one or more beam pair links. A base station may transmit indication of spatial QCL assumption between an DL RS antenna port(s) (for example, cell-specific CSI-RS, or wireless device-specific CSI-RS, or SS block, or PBCH with or without DM-RSs of PBCH), and DL RS antenna port(s) for demodulation of DL control channel. Signaling for beam indication for a PDCCH may be MAC CE signaling, or RRC signaling, or DCI signaling, or specification-transparent and/or implicit method, and combination of these signaling methods.

For reception of unicast DL data channel, a base station may indicate spatial QCL parameters between DL RS antenna port(s) and DM-RS antenna port(s) of DL data channel. The base station may transmit DCI (e.g. downlink grants) comprising information indicating the RS antenna port(s). The information may indicate RS antenna port(s) which may be QCL-ed with the DM-RS antenna port(s). Different set of DM-RS antenna port(s) for a DL data channel may be indicated as QCL with different set of the RS antenna port(s).

FIG. 9A is an example of beam sweeping in a DL channel. In an RRC_INACTIVE state or RRC_IDLE state, a wireless device may assume that SS blocks form an SS burst 940, and an SS burst set 950. The SS burst set 950 may have a given periodicity. For example, in a multi-beam operation, a base station 120 may transmit SS blocks in multiple beams, together forming a SS burst 940. One or more SS blocks may be transmitted on one beam. If multiple SS bursts 940 are transmitted with multiple beams, SS bursts together may form SS burst set 950.

A wireless device may further use CSI-RS in the multi-beam operation for estimating a beam quality of a links between a wireless device and a base station. A beam may be associated with a CSI-RS. For example, a wireless device may, based on a RSRP measurement on CSI-RS, report a beam index, as indicated in a CRI for downlink beam selection, and associated with a RSRP value of a beam. A CSI-RS may be transmitted on a CSI-RS resource including at least one of one or more antenna ports, one or more time or frequency radio resources. A CSI-RS resource may be configured in a cell-specific way by common RRC signaling, or in a wireless device-specific way by dedicated RRC signaling, and/or L1/L2 signaling. Multiple wireless devices covered by a cell may measure a cell-specific CSI-RS resource. A dedicated subset of wireless devices covered by a cell may measure a wireless device-specific CSI-RS resource.

A CSI-RS resource may be transmitted periodically, or using aperiodic transmission, or using a multi-shot or semi-persistent transmission. For example, in a periodic transmission in FIG. 9A, a base station 120 may transmit configured CSI-RS resources 940 periodically using a configured periodicity in a time domain. In an aperiodic transmission, a configured CSI-RS resource may be transmitted in a dedicated time slot. In a multi-shot or semi-persistent transmission, a configured CSI-RS resource may be transmitted within a configured period. Beams used for CSI-RS transmission may have different beam width than beams used for SS-blocks transmission.

FIG. 9B is an example of a beam management procedure in an example new radio network. A base station 120 and/or a wireless device 110 may perform a downlink L1/L2 beam management procedure. One or more of the following downlink L1/L2 beam management procedures may be performed within one or more wireless devices 110 and one or more base stations 120. In an example, a P-1 procedure 910 may be used to enable the wireless device 110 to measure one or more Transmission (Tx) beams associated with the base station 120 to support a selection of a first set of Tx beams associated with the base station 120 and a first set of Rx beam(s) associated with a wireless device 110. For beamforming at a base station 120, a base station 120 may sweep a set of different TX beams. For beamforming at a wireless device 110, a wireless device 110 may sweep a set of different Rx beams. In an example, a P-2 procedure 920 may be used to enable a wireless device 110 to measure one or more Tx beams associated with a base station 120 to possibly change a first set of Tx beams associated with a base station 120. A P-2 procedure 920 may be performed on a possibly smaller set of beams for beam refinement than in the P-1 procedure 910. A P-2 procedure 920 may be a special case of a P-1 procedure 910. In an example, a P-3 procedure 930 may be used to enable a wireless device 110 to measure at least one Tx beam associated with a base station 120 to change a first set of Rx beams associated with a wireless device 110.

A wireless device 110 may transmit one or more beam management reports to a base station 120. In one or more beam management reports, a wireless device 110 may indicate some beam pair quality parameters, comprising at least, one or more beam identifications; RSRP; Precoding Matrix Indicator (PMI)/Channel Quality Indicator (CQI)/Rank Indicator (RI) of a subset of configured beams. Based on one or more beam management reports, a base station 120 may transmit to a wireless device 110 a signal indicating that one or more beam pair links are one or more serving beams. A base station 120 may transmit PDCCH and PDSCH for a wireless device 110 using one or more serving beams.

In an example embodiment, new radio network may support a Bandwidth Adaptation (BA). In an example, receive and/or transmit bandwidths configured by an UE employing a BA may not be large. For example, a receive and/or transmit bandwidths may not be as large as a bandwidth of a cell. Receive and/or transmit bandwidths may be adjustable. For example, a UE may change receive and/or transmit bandwidths, e.g., to shrink during period of low activity to save power. For example, a UE may change a location of receive and/or transmit bandwidths in a frequency domain, e.g. to increase scheduling flexibility. For example, a UE may change a subcarrier spacing, e.g. to allow different services.

In an example embodiment, a subset of a total cell bandwidth of a cell may be referred to as a Bandwidth Part (BWP). A base station may configure a UE with one or more BWPs to achieve a BA. For example, a base station may indicate, to a UE, which of the one or more (configured) BWPs is an active BWP.

FIG. 10 is an example diagram of 3 BWPs configured: BWP1 (1010 and 1050) with a width of 40 MHz and subcarrier spacing of 15 kHz; BWP2 (1020 and 1040) with a width of 10 MHz and subcarrier spacing of 15 kHz; BWP3 1030 with a width of 20 MHz and subcarrier spacing of 60 kHz.

In an example, a UE, configured for operation in one or more BWPs of a cell, may be configured by one or more higher layers (e.g. RRC layer) for a cell a set of one or more BWPs (e.g., at most four BWPs) for receptions by the UE (DL BWP set) in a DL bandwidth by at least one parameter DL-BWP and a set of one or more BWPs (e.g., at most four BWPs) for transmissions by a UE (UL BWP set) in an UL bandwidth by at least one parameter UL-BWP for a cell.

To enable BA on the PCell, a base station may configure a UE with one or more UL and DL BWP pairs. To enable BA on SCells (e.g., in case of CA), a base station may configure a UE at least with one or more DL BWPs (e.g., there may be none in an UL).

In an example, an initial active DL BWP may be defined by at least one of a location and number of contiguous PRBs, a subcarrier spacing, or a cyclic prefix, for a control resource set for at least one common search space. For operation on the PCell, one or more higher layer parameters may indicate at least one initial UL BWP for a random access procedure. If a UE is configured with a secondary carrier on a primary cell, the UE may be configured with an initial BWP for random access procedure on a secondary carrier.

In an example, for unpaired spectrum operation, a UE may expect that a center frequency for a DL BWP may be same as a center frequency for a UL BWP.

For example, for a DL BWP or an UL BWP in a set of one or more DL BWPs or one or more UL BWPs, respectively, a base statin may semi-statistically configure a UE for a cell with one or more parameters indicating at least one of following: a subcarrier spacing; a cyclic prefix; a number of contiguous PRBs; an index in the set of one or more DL BWPs and/or one or more UL BWPs; a link between a DL BWP and an UL BWP from a set of configured DL BWPs and UL BWPs; a DCI detection to a PDSCH reception timing; a PDSCH reception to a HARQ-ACK transmission timing value; a DCI detection to a PUSCH transmission timing value; an offset of a first PRB of a DL bandwidth or an UL bandwidth, respectively, relative to a first PRB of a bandwidth.

In an example, for a DL BWP in a set of one or more DL BWPs on a PCell, a base station may configure a UE with one or more control resource sets for at least one type of common search space and/or one UE-specific search space. For example, a base station may not configure a UE without a common search space on a PCell, or on a PSCell, in an active DL BWP.

For an UL BWP in a set of one or more UL BWPs, a base station may configure a UE with one or more resource sets for one or more PUCCH transmissions.

In an example, if a DCI comprises a BWP indicator field, a BWP indicator field value may indicate an active DL BWP, from a configured DL BWP set, for one or more DL receptions. If a DCI comprises a BWP indicator field, a BWP indicator field value may indicate an active UL BWP, from a configured UL BWP set, for one or more UL transmissions.

In an example, for a PCell, a base station may semi-statistically configure a UE with a default DL BWP among configured DL BWPs. If a UE is not provided a default DL BWP, a default BWP may be an initial active DL BWP.

In an example, a base station may configure a UE with a timer value for a PCell. For example, a UE may start a timer, referred to as BWP inactivity timer, when a UE detects a DCI indicating an active DL BWP, other than a default DL BWP, for a paired spectrum operation or when a UE detects a DCI indicating an active DL BWP or UL BWP, other than a default DL BWP or UL BWP, for an unpaired spectrum operation. The UE may increment the timer by an interval of a first value (e.g., the first value may be 1 millisecond or 0.5 milliseconds) if the UE does not detect a DCI during the interval for a paired spectrum operation or for an unpaired spectrum operation. In an example, the timer may expire when the timer is equal to the timer value. A UE may switch to the default DL BWP from an active DL BWP when the timer expires.

In an example, a base station may semi-statistically configure a UE with one or more BWPs. A UE may switch an active BWP from a first BWP to a second BWP in response to receiving a DCI indicating the second BWP as an active BWP and/or in response to an expiry of BWP inactivity timer (for example, the second BWP may be a default BWP). For example, FIG. 10 is an example diagram of 3 BWPs configured, BWP1 (1010 and 1050), BWP2 (1020 and 1040), and BWP3 (1030). BWP2 (1020 and 1040) may be a default BWP. BWP1 (1010) may be an initial active BWP. In an example, a UE may switch an active BWP from BWP1 1010 to BWP2 1020 in response to an expiry of BWP inactivity timer. For example, a UE may switch an active BWP from BWP2 1020 to BWP3 1030 in response to receiving a DCI indicating BWP3 1030 as an active BWP. Switching an active BWP from BWP3 1030 to BWP2 1040 and/or from BWP2 1040 to BWP1 1050 may be in response to receiving a DCI indicating an active BWP and/or in response to an expiry of BWP inactivity timer.

In an example, if a UE is configured for a secondary cell with a default DL BWP among configured DL BWPs and a timer value, UE procedures on a secondary cell may be same as on a primary cell using the timer value for the secondary cell and the default DL BWP for the secondary cell.

In an example, if a base station configures a UE with a first active DL BWP and a first active UL BWP on a secondary cell or carrier, a UE may employ an indicated DL BWP and an indicated UL BWP on a secondary cell as a respective first active DL BWP and first active UL BWP on a secondary cell or carrier.

FIG. 11A and FIG. 11B show packet flows employing a multi connectivity (e.g. dual connectivity, multi connectivity, tight interworking, and/or the like). FIG. 11A is an example diagram of a protocol structure of a wireless device 110 (e.g. UE) with CA and/or multi connectivity as per an aspect of an embodiment. FIG. 11B is an example diagram of a protocol structure of multiple base stations with CA and/or multi connectivity as per an aspect of an embodiment. The multiple base stations may comprise a master node, MN 1130 (e.g. a master node, a master base station, a master gNB, a master eNB, and/or the like) and a secondary node, SN 1150 (e.g. a secondary node, a secondary base station, a secondary gNB, a secondary eNB, and/or the like). A master node 1130 and a secondary node 1150 may co-work to communicate with a wireless device 110.

When multi connectivity is configured for a wireless device 110, the wireless device 110, which may support multiple reception/transmission functions in an RRC connected state, may be configured to utilize radio resources provided by multiple schedulers of a multiple base stations. Multiple base stations may be inter-connected via a non-ideal or ideal backhaul (e.g. Xn interface, X2 interface, and/or the like). A base station involved in multi connectivity for a certain wireless device may perform at least one of two different roles: a base station may either act as a master base station or as a secondary base station. In multi connectivity, a wireless device may be connected to one master base station and one or more secondary base stations. In an example, a master base station (e.g. the MN 1130) may provide a master cell group (MCG) comprising a primary cell and/or one or more secondary cells for a wireless device (e.g. the wireless device 110). A secondary base station (e.g. the SN 1150) may provide a secondary cell group (SCG) comprising a primary secondary cell (PSCell) and/or one or more secondary cells for a wireless device (e.g. the wireless device 110).

In multi connectivity, a radio protocol architecture that a bearer employs may depend on how a bearer is setup. In an example, three different type of bearer setup options may be supported: an MCG bearer, an SCG bearer, and/or a split bearer. A wireless device may receive/transmit packets of an MCG bearer via one or more cells of the MCG, and/or may receive/transmits packets of an SCG bearer via one or more cells of an SCG. Multi-connectivity may also be described as having at least one bearer configured to use radio resources provided by the secondary base station. Multi-connectivity may or may not be configured/implemented in some of the example embodiments.

In an example, a wireless device (e.g. Wireless Device 110) may transmit and/or receive: packets of an MCG bearer via an SDAP layer (e.g. SDAP 1110), a PDCP layer (e.g. NR PDCP 1111), an RLC layer (e.g. MN RLC 1114), and a MAC layer (e.g. MN MAC 1118); packets of a split bearer via an SDAP layer (e.g. SDAP 1110), a PDCP layer (e.g. NR PDCP 1112), one of a master or secondary RLC layer (e.g. MN RLC 1115, SN RLC 1116), and one of a master or secondary MAC layer (e.g. MN MAC 1118, SN MAC 1119); and/or packets of an SCG bearer via an SDAP layer (e.g. SDAP 1110), a PDCP layer (e.g. NR PDCP 1113), an RLC layer (e.g. SN RLC 1117), and a MAC layer (e.g. MN MAC 1119).

In an example, a master base station (e.g. MN 1130) and/or a secondary base station (e.g. SN 1150) may transmit/receive: packets of an MCG bearer via a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), a master or secondary node PDCP layer (e.g. NR PDCP 1121, NR PDCP 1142), a master node RLC layer (e.g. MN RLC 1124, MN RLC 1125), and a master node MAC layer (e.g. MN MAC 1128); packets of an SCG bearer via a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), a master or secondary node PDCP layer (e.g. NR PDCP 1122, NR PDCP 1143), a secondary node RLC layer (e.g. SN RLC 1146, SN RLC 1147), and a secondary node MAC layer (e.g. SN MAC 1148); packets of a split bearer via a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), a master or secondary node PDCP layer (e.g. NR PDCP 1123, NR PDCP 1141), a master or secondary node RLC layer (e.g. MN RLC 1126, SN RLC 1144, SN RLC 1145, MN RLC 1127), and a master or secondary node MAC layer (e.g. MN MAC 1128, SN MAC 1148).

In multi connectivity, a wireless device may configure multiple MAC entities: one MAC entity (e.g. MN MAC 1118) for a master base station, and other MAC entities (e.g. SN MAC 1119) for a secondary base station. In multi-connectivity, a configured set of serving cells for a wireless device may comprise two subsets: an MCG comprising serving cells of a master base station, and SCGs comprising serving cells of a secondary base station. For an SCG, one or more of following configurations may be applied: at least one cell of an SCG has a configured UL CC and at least one cell of a SCG, named as primary secondary cell (PSCell, PCell of SCG, or sometimes called PCell), is configured with PUCCH resources; when an SCG is configured, there may be at least one SCG bearer or one Split bearer; upon detection of a physical layer problem or a random access problem on a PSCell, or a number of NR RLC retransmissions has been reached associated with the SCG, or upon detection of an access problem on a PSCell during a SCG addition or a SCG change: an RRC connection re-establishment procedure may not be triggered, UL transmissions towards cells of an SCG may be stopped, a master base station may be informed by a wireless device of a SCG failure type, for split bearer, a DL data transfer over a master base station may be maintained; an NR RLC acknowledged mode (AM) bearer may be configured for a split bearer; PCell and/or PSCell may not be de-activated; PSCell may be changed with a SCG change procedure (e.g. with security key change and a RACH procedure); and/or a bearer type change between a split bearer and a SCG bearer or simultaneous configuration of a SCG and a split bearer may or may not supported.

With respect to interaction between a master base station and a secondary base stations for multi-connectivity, one or more of the following may be applied: a master base station and/or a secondary base station may maintain RRM measurement configurations of a wireless device; a master base station may (e.g. based on received measurement reports, traffic conditions, and/or bearer types) may decide to request a secondary base station to provide additional resources (e.g. serving cells) for a wireless device; upon receiving a request from a master base station, a secondary base station may create/modify a container that may result in configuration of additional serving cells for a wireless device (or decide that the secondary base station has no resource available to do so); for a UE capability coordination, a master base station may provide (a part of) an AS configuration and UE capabilities to a secondary base station; a master base station and a secondary base station may exchange information about a UE configuration by employing of RRC containers (inter-node messages) carried via Xn messages; a secondary base station may initiate a reconfiguration of the secondary base station existing serving cells (e.g. PUCCH towards the secondary base station); a secondary base station may decide which cell is a PSCell within a SCG; a master base station may or may not change content of RRC configurations provided by a secondary base station; in case of a SCG addition and/or a SCG SCell addition, a master base station may provide recent (or the latest) measurement results for SCG cell(s); a master base station and secondary base stations may receive information of SFN and/or subframe offset of each other from OAM and/or via an Xn interface, (e.g. for a purpose of DRX alignment and/or identification of a measurement gap). In an example, when adding a new SCG SCell, dedicated RRC signaling may be used for sending required system information of a cell as for CA, except for a SFN acquired from a MIB of a PSCell of a SCG.

FIG. 12 is an example diagram of a random access procedure. One or more events may trigger a random access procedure. For example, one or more events may be at least one of following: initial access from RRC_IDLE, RRC connection re-establishment procedure, handover, DL or UL data arrival during RRC_CONNECTED when UL synchronization status is non-synchronised, transition from RRC_Inactive, and/or request for other system information. For example, a PDCCH order, a MAC entity, and/or a beam failure indication may initiate a random access procedure.

In an example embodiment, a random access procedure may be at least one of a contention based random access procedure and a contention free random access procedure. For example, a contention based random access procedure may comprise, one or more Msg 1 1220 transmissions, one or more Msg2 1230 transmissions, one or more Msg3 1240 transmissions, and contention resolution 1250. For example, a contention free random access procedure may comprise one or more Msg 1 1220 transmissions and one or more Msg2 1230 transmissions.

In an example, a base station may transmit (e.g., unicast, multicast, or broadcast), to a UE, a RACH configuration 1210 via one or more beams. The RACH configuration 1210 may comprise one or more parameters indicating at least one of following: available set of PRACH resources for a transmission of a random access preamble, initial preamble power (e.g., random access preamble initial received target power), an RSRP threshold for a selection of a SS block and corresponding PRACH resource, a power-ramping factor (e.g., random access preamble power ramping step), random access preamble index, a maximum number of preamble transmission, preamble group A and group B, a threshold (e.g., message size) to determine the groups of random access preambles, a set of one or more random access preambles for system information request and corresponding PRACH resource(s), if any, a set of one or more random access preambles for beam failure recovery request and corresponding PRACH resource(s), if any, a time window to monitor RA response(s), a time window to monitor response(s) on beam failure recovery request, and/or a contention resolution timer.

In an example, the Msg1 1220 may be one or more transmissions of a random access preamble. For a contention based random access procedure, a UE may select a SS block with a RSRP above the RSRP threshold. If random access preambles group B exists, a UE may select one or more random access preambles from a group A or a group B depending on a potential Msg3 1240 size. If a random access preambles group B does not exist, a UE may select the one or more random access preambles from a group A. A UE may select a random access preamble index randomly (e.g. with equal probability or a normal distribution) from one or more random access preambles associated with a selected group. If a base station semi-statistically configures a UE with an association between random access preambles and SS blocks, the UE may select a random access preamble index randomly with equal probability from one or more random access preambles associated with a selected SS block and a selected group.

For example, a UE may initiate a contention free random access procedure based on a beam failure indication from a lower layer. For example, a base station may semi-statistically configure a UE with one or more contention free PRACH resources for beam failure recovery request associated with at least one of SS blocks and/or CSI-RSs. If at least one of SS blocks with a RSRP above a first RSRP threshold amongst associated SS blocks or at least one of CSI-RSs with a RSRP above a second RSRP threshold amongst associated CSI-RSs is available, a UE may select a random access preamble index corresponding to a selected SS block or CSI-RS from a set of one or more random access preambles for beam failure recovery request.

For example, a UE may receive, from a base station, a random access preamble index via PDCCH or RRC for a contention free random access procedure. If a base station does not configure a UE with at least one contention free PRACH resource associated with SS blocks or CSI-RS, the UE may select a random access preamble index. If a base station configures a UE with one or more contention free PRACH resources associated with SS blocks and at least one SS block with a RSRP above a first RSRP threshold amongst associated SS blocks is available, the UE may select the at least one SS block and select a random access preamble corresponding to the at least one SS block. If a base station configures a UE with one or more contention free PRACH resources associated with CSI-RSs and at least one CSI-RS with a RSRP above a second RSPR threshold amongst the associated CSI-RSs is available, the UE may select the at least one CSI-RS and select a random access preamble corresponding to the at least one CSI-RS.

A UE may perform one or more Msg1 1220 transmissions by transmitting the selected random access preamble. For example, if a UE selects an SS block and is configured with an association between one or more PRACH occasions and one or more SS blocks, the UE may determine an PRACH occasion from one or more PRACH occasions corresponding to a selected SS block. For example, if a UE selects a CSI-RS and is configured with an association between one or more PRACH occasions and one or more CSI-RSs, the UE may determine a PRACH occasion from one or more PRACH occasions corresponding to a selected CSI-RS. A UE may transmit, to a base station, a selected random access preamble via a selected PRACH occasions. A UE may determine a transmit power for a transmission of a selected random access preamble at least based on an initial preamble power and a power-ramping factor. A UE may determine a RA-RNTI associated with a selected PRACH occasions in which a selected random access preamble is transmitted. For example, a UE may not determine a RA-RNTI for a beam failure recovery request. A UE may determine an RA-RNTI at least based on an index of a first OFDM symbol and an index of a first slot of a selected PRACH occasions, and/or an uplink carrier index for a transmission of Msg1 1220.

In an example, a UE may receive, from a base station, a random access response, Msg 2 1230. A UE may start a time window (e.g., ra-Response Window) to monitor a random access response. For beam failure recovery request, a base station may configure a UE with a different time window (e.g., bfr-Response Window) to monitor response on beam failure recovery request. For example, a UE may start a time window (e.g., ra-ResponseWindow or bfr-Response Window) at a start of a first PDCCH occasion after a fixed duration of one or more symbols from an end of a preamble transmission. If a UE transmits multiple preambles, the UE may start a time window at a start of a first PDCCH occasion after a fixed duration of one or more symbols from an end of a first preamble transmission. A UE may monitor a PDCCH of a cell for at least one random access response identified by a RA-RNTI or for at least one response to beam failure recovery request identified by a C-RNTI while a timer for a time window is running.

In an example, a UE may consider a reception of random access response successful if at least one random access response comprises a random access preamble identifier corresponding to a random access preamble transmitted by the UE. A UE may consider the contention free random access procedure successfully completed if a reception of random access response is successful. If a contention free random access procedure is triggered for a beam failure recovery request, a UE may consider a contention free random access procedure successfully complete if a PDCCH transmission is addressed to a C-RNTI. In an example, if at least one random access response comprises only a random access preamble identifier, a UE may consider the random access procedure successfully completed and may indicate a reception of an acknowledgement for a system information request to upper layers. If a UE has signaled multiple preamble transmissions, the UE may stop transmitting remaining preambles (if any) in response to a successful reception of a corresponding random access response.

In an example, a UE may perform one or more Msg 3 1240 transmissions in response to a successful reception of random access response (e.g., for a contention based random access procedure). A UE may adjust an uplink transmission timing based on a timing advanced command indicated by a random access response and may transmit one or more transport blocks based on an uplink grant indicated by a random access response. Subcarrier spacing for PUSCH transmission for Msg3 1240 may be provided by at least one higher layer (e.g. RRC) parameter. A UE may transmit a random access preamble via PRACH and Msg3 1240 via PUSCH on a same cell. A base station may indicate an UL BWP for a PUSCH transmission of Msg3 1240 via system information block. A UE may employ HARQ for a retransmission of Msg 3 1240.

In an example, multiple UEs may perform Msg 1 1220 by transmitting a same preamble to a base station and receive, from the base station, a same random access response comprising an identity (e.g., TC-RNTI). Contention resolution 1250 may ensure that a UE does not incorrectly use an identity of another UE. For example, contention resolution 1250 may be based on C-RNTI on PDCCH or a UE contention resolution identity on DL-SCH. For example, if a base station assigns a C-RNTI to a UE, the UE may perform contention resolution 1250 based on a reception of a PDCCH transmission that is addressed to the C-RNTI. In response to detection of a C-RNTI on a PDCCH, a UE may consider contention resolution 1250 successful and may consider a random access procedure successfully completed. If a UE has no valid C-RNTI, a contention resolution may be addressed by employing a TC-RNTI. For example, if a MAC PDU is successfully decoded and a MAC PDU comprises a UE contention resolution identity MAC CE that matches the CCCH SDU transmitted in Msg3 1250, a UE may consider the contention resolution 1250 successful and may consider the random access procedure successfully completed.

FIG. 13 is an example structure for MAC entities as per an aspect of an embodiment. In an example, a wireless device may be configured to operate in a multi-connectivity mode. A wireless device in RRC_CONNECTED with multiple RX/TX may be configured to utilize radio resources provided by multiple schedulers located in a plurality of base stations. The plurality of base stations may be connected via a non-ideal or ideal backhaul over the Xn interface. In an example, a base station in a plurality of base stations may act as a master base station or as a secondary base station. A wireless device may be connected to one master base station and one or more secondary base stations. A wireless device may be configured with multiple MAC entities, e.g. one MAC entity for master base station, and one or more other MAC entities for secondary base station(s). In an example, a configured set of serving cells for a wireless device may comprise two subsets: an MCG comprising serving cells of a master base station, and one or more SCGs comprising serving cells of a secondary base station(s). FIG. 13 illustrates an example structure for MAC entities when MCG and SCG are configured for a wireless device.

In an example, at least one cell in a SCG may have a configured UL CC, wherein a cell of at least one cell may be called PSCell or PCell of SCG, or sometimes may be simply called PCell. A PSCell may be configured with PUCCH resources. In an example, when a SCG is configured, there may be at least one SCG bearer or one split bearer. In an example, upon detection of a physical layer problem or a random access problem on a PSCell, or upon reaching a number of RLC retransmissions associated with the SCG, or upon detection of an access problem on a PSCell during a SCG addition or a SCG change: an RRC connection re-establishment procedure may not be triggered, UL transmissions towards cells of an SCG may be stopped, a master base station may be informed by a UE of a SCG failure type and DL data transfer over a master base station may be maintained.

In an example, a MAC sublayer may provide services such as data transfer and radio resource allocation to upper layers (e.g. 1310 or 1320). A MAC sublayer may comprise a plurality of MAC entities (e.g. 1350 and 1360). A MAC sublayer may provide data transfer services on logical channels. To accommodate different kinds of data transfer services, multiple types of logical channels may be defined. A logical channel may support transfer of a particular type of information. A logical channel type may be defined by what type of information (e.g., control or data) is transferred. For example, BCCH, PCCH, CCCH and DCCH may be control channels and DTCH may be a traffic channel. In an example, a first MAC entity (e.g. 1310) may provide services on PCCH, BCCH, CCCH, DCCH, DTCH and MAC control elements. In an example, a second MAC entity (e.g. 1320) may provide services on BCCH, DCCH, DTCH and MAC control elements.

A MAC sublayer may expect from a physical layer (e.g. 1330 or 1340) services such as data transfer services, signaling of HARQ feedback, signaling of scheduling request or measurements (e.g. CQI). In an example, in dual connectivity, two MAC entities may be configured for a wireless device: one for MCG and one for SCG. A MAC entity of wireless device may handle a plurality of transport channels. In an example, a first MAC entity may handle first transport channels comprising a PCCH of MCG, a first BCH of MCG, one or more first DL-SCHs of MCG, one or more first UL-SCHs of MCG and one or more first RACHs of MCG. In an example, a second MAC entity may handle second transport channels comprising a second BCH of SCG, one or more second DL-SCHs of SCG, one or more second UL-SCHs of SCG and one or more second RACHs of SCG.

In an example, if a MAC entity is configured with one or more SCells, there may be multiple DL-SCHs and there may be multiple UL-SCHs as well as multiple RACHs per MAC entity. In an example, there may be one DL-SCH and UL-SCH on a SpCell. In an example, there may be one DL-SCH, zero or one UL-SCH and zero or one RACH for an SCell. A DL-SCH may support receptions using different numerologies and/or TTI duration within a MAC entity. A UL-SCH may also support transmissions using different numerologies and/or TTI duration within the MAC entity.

In an example, a MAC sublayer may support different functions and may control these functions with a control (e.g. 1355 or 1365) element. Functions performed by a MAC entity may comprise mapping between logical channels and transport channels (e.g., in uplink or downlink), multiplexing (e.g. 1352 or 1362) of MAC SDUs from one or different logical channels onto transport blocks (TB) to be delivered to the physical layer on transport channels (e.g., in uplink), demultiplexing (e.g. 1352 or 1362) of MAC SDUs to one or different logical channels from transport blocks (TB) delivered from the physical layer on transport channels (e.g., in downlink), scheduling information reporting (e.g., in uplink), error correction through HARQ in uplink or downlink (e.g. 1363), and logical channel prioritization in uplink (e.g. 1351 or 1361). A MAC entity may handle a random access process (e.g. 1354 or 1364).

FIG. 14 is an example diagram of a RAN architecture comprising one or more base stations. In an example, a protocol stack (e.g. RRC, SDAP, PDCP, RLC, MAC, and PHY) may be supported at a node. A base station (e.g. gNB 120A or 120B) may comprise a base station central unit (CU) (e.g. gNB-CU 1420A or 1420B) and at least one base station distributed unit (DU) (e.g. gNB-DU 1430A, 1430B, 1430C, or 1430D) if a functional split is configured. Upper protocol layers of a base station may be located in a base station CU, and lower layers of the base station may be located in the base station DUs. An F1 interface (e.g. CU-DU interface) connecting a base station CU and base station DUs may be an ideal or non-ideal backhaul. F1-C may provide a control plane connection over an F1 interface, and F1-U may provide a user plane connection over the F1 interface. In an example, an Xn interface may be configured between base station CUs.

In an example, a base station CU may comprise an RRC function, an SDAP layer, and a PDCP layer, and base station DUs may comprise an RLC layer, a MAC layer, and a PHY layer. In an example, various functional split options between a base station CU and base station DUs may be possible by locating different combinations of upper protocol layers (RAN functions) in a base station CU and different combinations of lower protocol layers (RAN functions) in base station DUs. A functional split may support flexibility to move protocol layers between a base station CU and base station DUs depending on service requirements and/or network environments.

In an example, functional split options may be configured per base station, per base station CU, per base station DU, per UE, per bearer, per slice, or with other granularities. In per base station CU split, a base station CU may have a fixed split option, and base station DUs may be configured to match a split option of a base station CU. In per base station DU split, a base station DU may be configured with a different split option, and a base station CU may provide different split options for different base station DUs. In per UE split, a base station (base station CU and at least one base station DUs) may provide different split options for different wireless devices. In per bearer split, different split options may be utilized for different bearers. In per slice splice, different split options may be applied for different slices.

FIG. 15 is an example diagram showing RRC state transitions of a wireless device. In an example, a wireless device may be in at least one RRC state among an RRC connected state (e.g. RRC Connected 1530, RRC_Connected), an RRC idle state (e.g. RRC Idle 1510, RRC_Idle), and/or an RRC inactive state (e.g. RRC_Inactive 1520, RRC_Inactive). In an example, in an RRC connected state, a wireless device may have at least one RRC connection with at least one base station (e.g. gNB and/or eNB), which may have a UE context of the wireless device. A UE context (e.g. a wireless device context) may comprise at least one of an access stratum context, one or more radio link configuration parameters, bearer (e.g. data radio bearer (DRB), signaling radio bearer (SRB), logical channel, QoS flow, PDU session, and/or the like) configuration information, security information, PHY/MAC/RLC/PDCP/SDAP layer configuration information, and/or the like configuration information for a wireless device. In an example, in an RRC idle state, a wireless device may not have an RRC connection with a base station, and a UE context of a wireless device may not be stored in a base station. In an example, in an RRC inactive state, a wireless device may not have an RRC connection with a base station. A UE context of a wireless device may be stored in a base station, which may be called as an anchor base station (e.g. last serving base station).

In an example, a wireless device may transition a UE RRC state between an RRC idle state and an RRC connected state in both ways (e.g. connection release 1540 or connection establishment 1550; or connection reestablishment) and/or between an RRC inactive state and an RRC connected state in both ways (e.g. connection inactivation 1570 or connection resume 1580). In an example, a wireless device may transition its RRC state from an RRC inactive state to an RRC idle state (e.g. connection release 1560).

In an example, an anchor base station may be a base station that may keep a UE context (a wireless device context) of a wireless device at least during a time period that a wireless device stays in a RAN notification area (RNA) of an anchor base station, and/or that a wireless device stays in an RRC inactive state. In an example, an anchor base station may be a base station that a wireless device in an RRC inactive state was lastly connected to in a latest RRC connected state or that a wireless device lastly performed an RNA update procedure in. In an example, an RNA may comprise one or more cells operated by one or more base stations. In an example, a base station may belong to one or more RNAs. In an example, a cell may belong to one or more RNAs.

In an example, a wireless device may transition a UE RRC state from an RRC connected state to an RRC inactive state in a base station. A wireless device may receive RNA information from the base station. RNA information may comprise at least one of an RNA identifier, one or more cell identifiers of one or more cells of an RNA, a base station identifier, an IP address of the base station, an AS context identifier of the wireless device, a resume identifier, and/or the like.

In an example, an anchor base station may broadcast a message (e.g. RAN paging message) to base stations of an RNA to reach to a wireless device in an RRC inactive state, and/or the base stations receiving the message from the anchor base station may broadcast and/or multicast another message (e.g. paging message) to wireless devices in their coverage area, cell coverage area, and/or beam coverage area associated with the RNA through an air interface.

In an example, when a wireless device in an RRC inactive state moves into a new RNA, the wireless device may perform an RNA update (RNAU) procedure, which may comprise a random access procedure by the wireless device and/or a UE context retrieve procedure. A UE context retrieve may comprise: receiving, by a base station from a wireless device, a random access preamble; and fetching, by a base station, a UE context of the wireless device from an old anchor base station. Fetching may comprise: sending a retrieve UE context request message comprising a resume identifier to the old anchor base station and receiving a retrieve UE context response message comprising the UE context of the wireless device from the old anchor base station.

In an example embodiment, a wireless device in an RRC inactive state may select a cell to camp on based on at least a on measurement results for one or more cells, a cell where a wireless device may monitor an RNA paging message and/or a core network paging message from a base station. In an example, a wireless device in an RRC inactive state may select a cell to perform a random access procedure to resume an RRC connection and/or to transmit one or more packets to a base station (e.g. to a network). In an example, if a cell selected belongs to a different RNA from an RNA for a wireless device in an RRC inactive state, the wireless device may initiate a random access procedure to perform an RNA update procedure. In an example, if a wireless device in an RRC inactive state has one or more packets, in a buffer, to transmit to a network, the wireless device may initiate a random access procedure to transmit one or more packets to a base station of a cell that the wireless device selects. A random access procedure may be performed with two messages (e.g. 2 stage random access) and/or four messages (e.g. 4 stage random access) between the wireless device and the base station.

In an example embodiment, a base station receiving one or more uplink packets from a wireless device in an RRC inactive state may fetch a UE context of a wireless device by transmitting a retrieve UE context request message for the wireless device to an anchor base station of the wireless device based on at least one of an AS context identifier, an RNA identifier, a base station identifier, a resume identifier, and/or a cell identifier received from the wireless device. In response to fetching a UE context, a base station may transmit a path switch request for a wireless device to a core network entity (e.g. AMF, MME, and/or the like). A core network entity may update a downlink tunnel endpoint identifier for one or more bearers established for the wireless device between a user plane core network entity (e.g. UPF, S-GW, and/or the like) and a RAN node (e.g. the base station), e.g. changing a downlink tunnel endpoint identifier from an address of the anchor base station to an address of the base station.

In an example, when a cell is configured with at least one closed access group (CAG) for a non-public network (NPN), a wireless device may need a membership for one of the at least one CAG (e.g., need verification to access the at least one CAG) to access the cell and/or the NPN. In an existing technology of a base station configured with split central unit and distributed unit (e.g., a CU-DU split base station), a base station central unit may request, to a base station distributed unit, to configure a cell of a CAG for a wireless device that is not allowed to access the CAG, and/or the base station distributed unit may reject the request due to an invalid membership of the wireless device for the CAG. In an existing technology, a base station central unit may send, to a base station distributed that only serves cells of a CAG, a paging message for a wireless device that is not allowed to access the CAG, and/or the base station distributed unit may not transmit a paging indication via any serving cell due to an invalid membership of the wireless device. The existing interaction between a base station central unit and a base station distributed unit may increase unnecessary signaling for CAG cells and/or CAG wireless devices. An implementation of existing technologies may increase inefficient signaling and/or decrease communication reliability for wireless devices. An enhanced communication mechanism for CAG support is needed.

In existing technologies, a base station central unit may send a paging message (e.g., core network paging and/or RAN paging) for a wireless device to a base station distributed unit that does not have a cell for a first CAG when the wireless device is only allowed to access the first CAG. It is inefficient sending the paging message for the wireless device using the first CAG to a base station distributed unit that does not support the first CAG. Based on the paging message, the base station distributed unit may further send paging indications via multiple cells that do not support the first CAG. This implementation may increase inefficient radio resource utilization.

Example embodiments may support information sharing between a base station central unit and a base station distributed unit for CAG cell configurations. An implementation of example embodiments may support configuring cells selectively for a wireless device based on a CAG membership of the wireless device by providing a CAG cell information sharing mechanism via an F1 interface. An implementation of example embodiments may support paging a wireless device via selected base station distributed units based on a CAG membership of the wireless device by providing a CAG cell information sharing mechanism via an F1 interface. Example embodiments may reduce unnecessary signaling for CAG cells and increase signaling efficiency among network nodes.

In an example, if, when a cell allows a non-member of the CAG to access, a base station distributed unit only indicates to a base station central unit that the cell is for a CAG, the base station central unit may not try configuring the cell for a non-member wireless device of the CAG even though the non-member wireless device can access the cell. This implementation may increase inefficiency of radio resource utilization. Example embodiments may support that a base station distributed unit indicates, to a base station central unit, whether a cell of a CAG allows a non-member of the CAG to access the cell. The example embodiments may increase efficiency of resource utilization.

In existing technologies, if receiving a paging message for a wireless device from a base station central unit, a base station distributed unit may transmit/broadcast paging indications via one or more cells that do not support a first CAG when the wireless device is only allowed to access a cell of the first CAG. Transmitting/broadcasting the paging indications for the wireless device via the one or more cells not supporting the first CAG increases inefficient signaling and inefficient radio resource utilization. In existing technologies, if receiving a paging message for a wireless device from a base station central unit, a base station distributed unit may transmit/broadcast paging indications via one or more cells that only support one or more second CAGs that the wireless device is not allowed to access. Transmitting/broadcasting the paging indications for the wireless device via the one or more cells only supporting the one or more second CAGs increases inefficient signaling and inefficient radio resource utilization. Example embodiments may support that a paging message that a base station distributed unit receives from a base station central unit indicates whether the paging message is for a wireless device that is only allowed to access a first CAG. Example embodiments may support that a paging message that a base station distributed unit receives from a base station central unit indicates one or more CAGs that a wireless device that is allowed to access. Example embodiments may increase efficiency of signaling and radio resource utilization.

A non-public networks (NPN) may be intended for the use of a private entity such as an enterprise, and may be deployed in a variety of configurations, utilizing both virtual and physical elements. The NPN may be deployed as standalone networks (i.e. stand-alone non-public network (SNPN)). As an implementation alternative, the NPN may be hosted by a PLMN and may be offered as a slice of a PLMN (i.e. a public network integrated NPN).

Public network integrated NPNs may be NPNs made available via PLMNs, e.g., by means of dedicated DNNs, or by one (or more) network slice instances allocated for the NPN. When an NPN is made available via a PLMN, then the wireless device may have a subscription for the PLMN. As network slicing does not enable the possibility to prevent wireless devices from trying to access the network in areas which the wireless device is not allowed to use the network slice allocated for the NPN, closed access groups (CAG)s may be used in addition to network slicing to apply access control.

A CAG may identify a group of subscribers who are permitted to access one or more cells associated to the CAG. In an example, CAG is used for the public network integrated NPNs to prevent wireless device(s), which are not allowed to access the NPN via the associated cell(s), from automatically selecting and accessing the associated cell(s).

In an example, a CAG is identified by a CAG identifier which is unique within the scope of a PLMN ID. A CAG cell may broadcast one or multiple CAG Identifiers per PLMN. It is assumed that a base station (e.g. NG-RAN) supports broadcasting a total of twelve CAG Identifiers. A CAG cell may in addition broadcast a human-readable network name per CAG Identifier. In an example, the human-readable network name may be an enterprise name and used for presentation to user when user requests a manual CAG selection.

To support CAG, the wireless device may be configured, using the UE configuration update procedure for access and mobility management related parameters with the CAG information, included in the subscription as part of the Mobility Restriction. The CAG information may comprise an allowed CAG list (i.e. a list of CAG Identifiers the UE is allowed to access), an indication whether the UE is only allowed to access 5 GS via CAG cells, and/or the like. In an example, the indication is a CAG restriction indicator.

To support CAG, a base station may broadcast CAG related information via cells. In an example, a cell broadcasting one or more CAG identity may a CAG cell. In an example, a cell does not broadcast any CAG identity may be a non-CAG cell. In an example, the CAG related information may comprise an indication that only wireless device supporting CAG is allowed to access. The CAG cell and non-CAG cell may broadcast the indication. The indication of the CAG cell may be positive value and the indication of the non-CAG cell may be negative value. In an example, a wireless device may determine whether to access the cells base on the CAG related information. The mobility (e.g. cell-reselection for camping, handover) of a wireless device may be controlled/restricted by the CAG information of the wireless device and the CAG related information of the base station/cell.

FIG. 16 and FIG. 17 shows examples of CAG and/or CAG cell deployment. A coverage area of a first CAG may be overlapped with a second CAG. A CAG may cover a part of a PLMN network. An NPN may configure multiple CAGs to implement differentiated access control for different UEs or different areas. Multiple CAGs of different NPNs may share the same cell.

In an example, a CAG identifier may be used by a base station to select appropriate, a wireless device is configured as CAG identifier 1 (CAG 1) and is accessing to a base station which broadcasts CAG 1, CAG 2 via system information. The wireless device may send a radio resource control (RRC) message after a completion of RRC connection setup with the base station, requesting a connection transition from CM-IDLE to CM-CONNECTED. In an example, the RRC message is RRC connection setup complete message. The RRC message may comprise a NAS request message and access network (AN) parameter. In an example, the NAS request message is a registration request message or a service request message. In an example, the AN parameter may include CAG identifier (CAG 1). The base station may check whether the CAG identifier in the AN parameter is supported by the cell. The base station may select an appropriate AMF based on the CAG identifier (CAG 1). In an example, two or more AMFs may be connected with the base station, and some AMFs may not support CAG 1 or slice corresponding to the CAG 1. The base station may send an N2 message comprising the NAS message and the CAG identifier in the RRC message, to the AMF.

In an example, the AMF may have context information of the wireless device comprising CAG white list and the CAG white list includes CAG 1. In this case, the AMF may determine that the wireless device allowed to access the 5GS via the base station and may send an NAS accept message to the wireless device in response to the determining.

In an example, if the AMF has context information of the wireless device but does not have CAG identifier (CAG 1), the AMF may check with a UDM whether the UE is allowed to access the base station. If the wireless device is allowed to access cell with CAG 1, the AMF may include CAG 1 into a CAG white list of the wireless device and send a NAS accept message to the wireless device. If the wireless device is not allowed to access cell with CAG 1, the AMF may reject the wireless device by sending a NAS reject message.

In an example, if the AMF does not have context information of the wireless device (this is maybe initial registration case), the AMF may interact with a UDM and check whether the UE is allowed to access the base station. If the wireless device is allowed to access cell with CAG 1, the AMF may include CAG 1 into a CAG white list of the wireless device and send a NAS accept message (i.e. registration accept) to the wireless device. If the wireless device is not allowed to access cell with CAG 1, the AMF may reject the wireless device by sending a NAS reject message (i.e. registration reject).

A wireless device may be accessing to a base station which in non-CAG cell. The wireless device may send a radio resource control (RRC) message after a completion of RRC connection setup with the base station, requesting a connection transition from CM-IDLE to CM-CONNECTED. In an example, the RRC message is RRC connection setup complete message. The RRC message may comprise a NAS request message and access network (AN) parameter. In an example, the NAS request message is a registration request message or a service request message. The base station may send an N2 message comprising the NAS message in the RRC message to the AMF. In an example, the N2 message does not include any CAG identifier.

In an example, the AMF may have context information of the wireless device comprising a CAG restriction indicator. The AMF may determine whether the wireless device is allowed to access the 5GS via the base station (non-CAG cell) based on the CAG restriction indicator of the wireless device. In an example, the AMF may determine that the wireless device is allowed to access the 5GS via non-CAG cell in response to the CAG restriction indicator being a negative value (i.e. the CAG restriction indicator saying that the wireless device is not restricted to access a 5GS via only CAG cell.). The AMF may send a NAS accept message to the wireless device in response to the determination. In an example, the AMF may determine that the wireless device is not allowed to access the 5GS via non-CAG cell in response to the CAG restriction indicator being a positive value (i.e. the CAG restriction indicator saying that the wireless device is restricted to access a 5GS via only CAG cell.). The AMF may send a NAS reject message with appropriate cause value to the wireless device in response to the determination. In an example, the cause value may indicate that the request is rejected since the wireless device is access via non-CAG cell.

In an example, if the AMF does not have context information of the wireless device (this is maybe initial registration case), the AMF may interact with a UDM and check whether the UE is allowed to access via a non-CAG cell based on a CAG restriction indicator of the wireless device. The AMF behavior is same with previous description based on the CAG restriction indicator of the wireless device.

In an example, as shown in FIG. 18, FIG. 20, FIG. 22, FIG. 24, FIG. 26, and/or FIG. 28, a base station (e.g., gNB, eNB, gNB1, eNB1, etc.) may comprise a base station distribute unit (e.g., gNB-DU, distributed unit, DU, IAB-node, etc.) and a base station central unit (e.g., gNB-CU, central unit, CU, IAB-donor, etc.). The base station may further comprise a second base station distributed unit (e.g., gNB-DU2, second distributed unit, DU2, IAB-node2, etc.). The base station distributed unit may be connected to the base station central unit via an F1 interface (e.g., direct interface). In an example, the base station distributed unit and/or the second base station distributed unit may comprise/provide lower layer functions of the base station. The lower layer functions may comprise at least one of: a radio link control (RLC) layer function; a medium access control (MAC) layer function; a physical layer function; and/or a part of a physical layer function. The base station central unit may comprise/provide upper layer functions of the base station. The upper layer functions may comprise at least one of: an RRC function; a service data adaptation protocol (SDAP) layer function; a packet data convergence protocol (PDCP) layer function; an RLC layer function; a MAC layer function; and/or a part of a physical layer function. The base station distribute unit may be an integrated access and backhaul (IAB) node. The base station central unit may be an IAB donor. In an example, the base station and/or the base station central unit may be connected to an access and mobility management function (AMF) via an N2 interface (e.g., S1 interface, S1-C) (e.g., for control plane connection), and/or may be connected to a user plane function (UPF) via an N3 interface (e.g., S1 interface, S1-U) (e.g., for user plane connection). In an example, the base station and/or the base station central unit may be connected to a second base station (e.g., gNB2, eNB2, a neighboring base station of the base station, etc.) via an Xn interface (e.g., X2 interface).

In an example, the base station distributed unit may send, to the base station central unit, a configuration request message comprising cell information of one or more cells of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group. The base station distributed unit may receive a response message for the configuration request message.

In an example, as shown in FIG. 18 and/or FIG. 19, the base station central unit may determine, based on the cell information, cell configuration parameters of the one or more cells for a wireless device. The wireless device may be allowed to access the first closed access group. The base station distributed unit may receive, from the base station central unit, a context configuration request message comprising the cell configuration parameters of the one or more cells for the wireless device.

In an example, as shown in FIG. 22 and/or FIG. 23, the base station central unit may determine, based on the cell information, to send a paging message to the base station distributed unit for a second wireless device. The second wireless device may be allowed to access the first closed access group. The base station distributed unit may receive, from the base station central unit and based on the cell information, the paging message for the second wireless device. The base station distributed unit may transmit, in response to receiving the paging message, a paging indication for the second wireless device.

The base station central unit may receive, from a second base station distributed unit, a second configuration request message comprising second cell information of one or more second cells (e.g. all serving cells) of the second base station distributed unit. The second cell information may indicate that the one or more second cells are not associated with the first closed access group (e.g., associated with a second closed access group). The base station central unit may determine, based on the second cell information, to not configure the one or more second cells of the second base station distributed unit for the wireless device. The base station central unit may determine, based on the second cell information, to not send a paging message to the second base station distributed unit for the wireless device.

In an example, the base station distributed unit may send, to the base station central unit, a configuration request message (e.g., one or more configuration request messages) comprising cell information of one or more cells of the base station distributed unit. The one or more cells may be a serving cell of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group (CAG). In an example, the one or more cells may belong to the first CAG. The first CAG may be associated with at least one of a first non-public network (NPN), a first network slice, and/or a first PLMN. Wireless devices may access to a first NPN via the one or more cells. The first CAG may be configured to perform access control for wireless devices that try/attempt to employ/access the first NPN. The first NPN may be assigned/configured with the first network slice (e.g., in a PLMN; e.g., in the first PLMN). In an example, wireless devices may employ/use the first PLMN to access/use the first NPN.

In an example, the base station distributed unit (e.g., IAB-node) may select the base station central unit (e.g., IAB-donor) based on the base station central unit being supporting the first CAG. The sending the configuration request message to the base station central unit may be based on the selecting the base station central unit (e.g., IAB-donor) based on the base station central unit being supporting the first CAG. The base station distributed unit may receive, from the base station central unit, a system information block comprising an identifier of the first CAG. The selecting the base station central unit may be based on the system information block.

In an example, the base station distributed unit may send the configuration request message via the F1 interface (e.g., interface between the base station central unit and the base station distributed unit). In an example, the configuration request message may comprise at least one of: an F1 message, an F1 setup request message; a base station distributed unit configuration update message (e.g., gNB-DU configuration update message); a base station central unit configuration update acknowledge message (e.g., gNB-CU configuration update acknowledge message); and/or the like. In an example, the configuration request message may comprise at least one of: a gNB-DU identifier of the base station distributed unit, a gNB-DU name of the base station distribute unit, gNB-DU RRC version information, and/or the like.

The one or more cells may be further associated with a second CAG. The second closed access group may be associated with at least one of: a second NPN, a second network slice, and/or a second PLMN. The one or more cells may be associated with multiple CAGs. The cell information of the one or more cells may indicate that the one or more cells are associated with multiple CAGs (e.g., the first CAG, the second CAG, etc.).

In an example, the cell information of the one or more cells may further indicate whether a non-member of the first CAG is allowed to access a cell (e.g., closed cell or hybrid cell) of the one or more cells. If a cell of the one or more cells is a closed cell (e.g., CAG cell), a non-member wireless device may not be able to access to the cell (e.g., membership verification may be failed). If a cell of the one or more cells is a hybrid cell, a non-member wireless device may be able to access to the cell and/or may be able to use limited QoS for services (e.g., may be guaranteed with deprioritized, discriminated QoS compared to a member wireless device). In an example, the cell information of the one or more cells may indicate whether a second wireless device that is a non-member of the first closed access group is allowed to access a cell (e.g., closed cell or hybrid cell) of the one or more cells.

In an example, the cell information of the one or more cells may comprise a physical cell identifier (PCI) indicating the cell of the one or more cells. The PCI may further indicate whether a non-member of the first CAG is allowed to access the cell (e.g., closed cell or hybrid cell) of the one or more cells. The PCI may further indicate whether the second wireless device that is a non-member of the first closed access group is allowed to access the cell (e.g., closed cell or hybrid cell) of the one or more cells. The cell of the one or more cells may be at least one of a closed cell and/or a hybrid cell. In an example, a cell assigned with one of a first range (e.g., PCI=1, 2, . . . , n−1) of PCIs may be a normal cell (e.g., hybrid cell). In an example, a cell assigned with one of a second range (e.g., PCI=n, n+1, . . . , k) of PCIs may be a CAG cell (e.g., closed cell).

In an example, the cell information of the one or more cells may comprise parameters for a cell (e.g., each cell) of the one or more cell. The parameters for the cell may comprise at least one of: gNB-DU system information, a cell identifier (e.g., global cell identifier, CGI, physical cell identifier, PCI, etc.), tracking area information (e.g., tracking area code, TAC, tracking area identifier, TAI, etc.), at least one PLMN identifier, a list of supported network slices (e.g., S-NSSAI, NSSAI; supported at a tracking area and/or a cell), FDD and/or TDD configuration parameters, downlink and/or uplink frequency/bandwidth information (e.g., frequency offset, band, bandwidth, bandwidth part configuration parameters, etc.), beam configuration parameters (e.g., SSB, CSI-RS, DM-RS parameters), measurement timing configuration information (e.g., SSB and/or RS configuration parameters for measurement; frequency/timing scheduling information), a RAN area code, and/or the like.

In an example, the base station distributed unit may receive a response message for the configuration request message. The base station distributed unit may receive, in response to sending the configuration request message, a response message for the configuration request message. The base station distributed unit may receive the response message via the F1 interface. In an example, the response message may comprise at least one of: an F1 message, an F1 setup response message, a base station distributed unit configuration update acknowledge message (e.g., gNB-DU configuration update acknowledge message), and/or the like.

In an example, the response message may comprise at least one of: a gNB-CU name of the base station central unit, a cell identifier (e.g., PCI, CGI) of an activated cell among the one or more cells of the base station distributed unit, gNB-CU system information (e.g., system information block, SIB) of an activated cell among the one or more cells of the base station distributed unit, one or more PLMNs of an activated cell among the one or more cells, and/or the like.

In an example, the response message may comprise a system information block (SIB) (e.g., at least one system information block) for a cell (e.g., activated cell, each of activated cell) of the one or more cells. The system information block may comprise an identifier (e.g., PCI, CGI) of the cell (e.g., activated cell) of the one or more cells. The system information block may comprise an identifier (e.g., CAG ID) of the first CAG (e.g., and/or the second CAG, multiple CAGs) for the cell (e.g., activated cell) of the one or more cells. The base station distributed unit may transmit/broadcast the system information block to one or more wireless devices (e.g., via a cell (e.g., the corresponding cell, the cell of the one or more cells) associated with the first closed access group). The system information block may further comprise at least one of: a network identifier of the first NPN associated with the first CAG; a first network slice selection assistance information (NSSAI) of the first network slice associated with the first CAG; and/or a first identifier of the first PLMN associated with the first CAG. The system information block may further comprise one or more cell identifiers of the one or more cells. One or more wireless device (e.g., a member of the first CAG) may transmit, to the base station distributed unit via the cell of the one or more cell, a random access preamble based on the system information block (e.g., based on the identifier of the first CAG).

In an example, as shown in FIG. 24 and/or FIG. 25, the base station central unit (e.g. the base station) may send, to the AMF and based on the cell information (e.g., of the configuration request message), a second configuration request message comprising second cell information of the base station and/or the base station central unit. In an example, the base station central unit may send the second configuration request message via the N2 interface (e.g., the S1 interface). The second configuration request message may comprise at least one of: a NG setup request message (e.g., S1 setup request message), a base station configuration update message (e.g., RAN/gNB/eNB configuration update message), a core node configuration update acknowledge message (e.g., AMF/MME configuration update acknowledge message), and/or the like.

In an example, the second cell information may comprise an identifier (e.g., CAG ID) of the first CAG (e.g., the second CAG, multiple CAGs, etc.). The second cell information may comprise a list of CAGs associated with one or more serving cells (e.g., the one or more cells) of the base station (e.g., the base station distributed unit and/or the base station central unit). The second cell information may comprise at least one of: an identifier (e.g., PCI, CGI, etc.) of a serving cell, an identifier of a CAG (e.g., the first CAG, the second CAG, etc.) associated with a serving cell, an identifier of an NPN (e.g., the first NPN, the second NPN, etc.) associated with a serving cell, an identifier of a PLMN (e.g., the first PLMN, the second PLMN, etc.) associated with a serving cell, etc.

The second cell information may further indicate whether a non-member of the first CAG is allowed to access at least one of serving cells (e.g., a closed cell or a hybrid cell) of the base station, the serving cells that are associated with the first CAG. The second cell information may further indicate whether a second wireless device that is a non-member of the first CAG is allowed to access at least one of serving cells (e.g., a closed cell or a hybrid cell) of the base station, the serving cells that are associated with the first CAG. The serving cell associated with the first CAG may be one of the one or more cells of the base station distributed unit.

In an example, the second cell information may further comprise at least one of: a list of tracking areas (TAs) supported by the base station (e.g., the base station central unit, the base station distributed unit, etc.), a list of PLMNs supported by the base station, a list of network slices supported by the base station and/or one or more of the TAs, and/or the like.

In an example, the AMF may determine a paging area (e.g., a target base station for paging) for paging a wireless device based on the second cell information. In an example, to page a wireless device that is a member of a CAG, the AMF may transmit a paging message to a base station that supports a CAG (e.g., serves a cell of the CAG) or that serves a normal cell (e.g., non-CAG cell, open/public cell) and/or a hybrid cell. The AMF may send a paging message to the base station (e.g., the base station central unit) to page a wireless device that is a member of the first CAG (e.g., the second CAG, the multiple CAGs, etc.).

In an example, the base station central unit may receive, from the AMF, a second response message for the second configuration request message. In an example, the base station central unit may receive, from the AMF and in response to sending the second configuration request message, a second response message for the second configuration request message. The base station central unit may receive the second response message via the NG interface (e.g., the S1 interface). The second response message may comprise at least one of: an identifier of the AMF (e.g., identifier of MME, GUAMI, etc.), an identifier of a supported PLMN, an identifier (e.g., NSSAI, S-NSSAI) of a supported network slice, an identifier of a supported NPN, an identifier of a supported CAG (e.g., indicating whether the first CAG is allowed for the base station; identifier of the first CAG if supported), and/or the like.

In an example, the base station central unit may determine cell configuration parameters of the one or more cells for a wireless device based on the cell information of the one or more cells. The base station central unit may determine, based on the cell information, whether to configure at least one of the one or more cells for the wireless device. In an example, if the at least one of one or more cells is associated with the first CAG and the wireless device is a member of the first CAG, the base station central unit may configure the at least one of the one or more cells for the wireless device. In an example, if the at least one of one or more cells is a normal cell (e.g., non-CAG cell, open cell, public cell, etc.) and/or a hybrid cell associated with the first CAG and the wireless device is a member or a non-member of the first CAG, the base station central unit may configure the at least one of the one or more cells for the wireless device. In an example, if the at least one of one or more cells is a closed cell (e.g., CAG cell) associated with the first CAG and the wireless device is a non-member of the first CAG, the base station central unit may not configure the at least one of the one or more cells for the wireless device. In an example, if the at least one of one or more cells is a hybrid cell (e.g., CAG hybrid cell) associated with the first CAG and the wireless device is a non-member of the first CAG, the base station central unit may configure the at least one of the one or more cells for the wireless device with a limited QoS (e.g., degraded/deprioritized/discriminated QoS for bearers).

In an example, the base station central unit may determine to configure the one or more cells for the wireless device further based on at least one of: receiving a handover request (e.g., via Xn/X2 interface and/or via the AMF) from a neighboring base station (e.g., the second base station) for the wireless device; receiving a secondary node addition/configuration request message (e.g., S-node/SgNB/SeNB addition request message, S-node/SgNB/SeNB configuration update message, etc.) from a neighboring base station (e.g., the second base station) for the wireless device; determining to handover (e.g., intra base station and inter base station distributed unit handover; intra base station and intra base station distributed unit handover; etc.) the wireless device to one of the one or more cells of the base station distributed unit; determining to add at least one of the one or more cells as at least one secondary cell of the wireless device; determining to add at least one of the one or more cells as a secondary cell group for the wireless device; determining to add the base station distributed unit as a secondary base station distribute unit for the wireless device; and/or the like.

In an example, as shown in FIG. 20 and/or FIG. 21, the base station central unit may receive, from the second base station, a handover request message for handover of the wireless device. In an example, the base station central unit may receive, from the second base station or from the AMF (e.g., the AMF may receive a handover required message from the second base station and send the handover request message to the base station central unit for the handover), the handover request message for the wireless device. In an example, the determining the cell configuration parameters of the one or more cells for the wireless device may be based on the handover request message. The handover request message may comprise an identifier (e.g., CGI, PCI) of a cell of the one or more cells as a handover target cell. The handover request message may comprise measurement results (e.g., RSRP, RSRQ, etc.) of at least one of the one or more cells that the wireless device measured.

In an example, as shown in FIG. 20 and/or FIG. 21, the base station central unit may receive, from the second base station, a secondary node configuration request message (e.g., S-node/SgNB/SeNB addition request message, S-node/SgNB/SeNB configuration update message, etc.) for the wireless device. In an example, the determining the cell configuration parameters of the one or more cells for the wireless device may be based on the secondary node configuration request message. The secondary node configuration request message may comprise an identifier (e.g., CGI, PCI) of a cell of the one or more cells as a target primary secondary cell (e.g., PScell, special cell, Spcell, etc.) and/or a target secondary cell (Scell). The secondary node configuration request message may comprise measurement results (e.g., RSRP, RSRQ, etc.) of at least one of the one or more cells that the wireless device measured.

In an example, the base station central unit may receive, from the wireless device (e.g., via the base station distributed unit and/or a second base station distributed unit), a measurement report comprising measurement results (e.g., RSRP, RSRQ, etc.) of at least one of the one or more cells. In an example, the base station central unit may determine, based on the measurement report, to handover (e.g., intra base station and inter base station distributed unit handover; intra base station and intra base station distributed unit handover; etc.) the wireless device to one of the one or more cells of the base station distributed unit. In an example, the base station central unit may determine, based on the measurement report, to add at least one of the one or more cells as at least one secondary cell of the wireless device. In an example, the determining the cell configuration parameters of the one or more cells for the wireless device may be based on determining to handover the wireless device to the one of the one or more cells. In an example, the determining the cell configuration parameters of the one or more cells for the wireless device may be based on determining to add the at least one of the one or more cells as at least one secondary cell for the wireless device.

In an example, the base station central unit may send, to the base station distributed unit, a context configuration request message comprising the cell configuration parameters of the one or more cells for the wireless device. In an example, as shown in FIG. 18 and/or FIG. 19, the base station distributed unit may receive, from the base station central unit, the context configuration request message comprising the cell configuration parameters for the wireless device. The wireless device be allowed to access the first CAG. In an example, the base station distributed unit may receive the context configuration request message via the F1 interface. In an example, the context configuration request message may comprise at least one of: a UE context setup request message, a UE context modification request message, a UE context modification confirm message, and/or the like.

In an example, the cell configuration parameters may comprise an information element indicating that a cell of the one or more cells is configured as a primary cell (e.g., Pcell, primary secondary cell, PScell, special cell, Spcell, etc.) or a secondary cell (e.g., Scell, primary secondary cell, PScell, special cell, Spcell, etc.) for the wireless device. The information element of the cell configuration parameters may comprise at least one of: a cell identifier (e.g., CGI, PCI, etc.) of the cell; a cell index of the cell; uplink configuration information (e.g., indicating the cell is configured with at least one of none uplink, a supplementary uplink, and/or a normal uplink); and/or a serving cell measurement object (e.g., measurement object identifier, servingCellMO).

In an example, the cell configuration parameters may comprise at least one cell identifier of at least one candidate special cell (e.g., primary cell, Pcell, primary secondary cell, PScell, etc.) for the wireless device. The at least one candidate special cell may be associated with the first closed access group.

In an example, the context configuration request message may comprise bearer configuration parameters of one or more bearers for a first network slice associated with the first closed access group. The bearer configuration parameters may comprise at least one of: an identifier of a bearer (e.g., signaling radio bearer, SRB, data radio bearer, DRB), an identifier of a logical channel associated with the bearer, an identifier of a session (e.g., PDU session) associated with the bearer, an identifier of a QoS flow associated with the bearer, QoS parameters for the bearer (e.g., QoS parameters for the session, the QoS flow, and/or the logical channel), a duplication indication of the bearer (e.g., indicating whether PDCP packet duplication is configured for the bearer), a network slice information (e.g., network slice identifier, NSSAI, S-NSSAI; e.g., identifier of the first network slice) associated with the bearer, a network identifier of a network (e.g., the first NPN) associated with the bearer, and/or the like.

The context configuration request message may comprise an identifier of at least one CAG (e.g., the first CAG) that the wireless device is allowed to access. The context configuration request message may comprise an identifier of at least one cell (e.g., the one or more cells) that the wireless device is allowed to access. The context configuration request message may comprise an identifier of at least one cell (e.g., the one or more cells) that the wireless device is configured with. The context configuration request message may comprise an identifier (e.g., IMEI, TMSI, UE F1 identifier, gNB-CU UE F1AP ID, gNB-DU UE F1 AP ID, etc.) of the wireless device. The context configuration request message may further comprise RRC configuration parameters for the wireless device.

In an example, the base station distribute unit may receive a second context configuration request message comprising second cell configuration parameters of the one or more cells for the second wireless device (e.g., a non-member of the first CAG; e.g., if the one or more cells are a hybrid cell) based on the cell information.

In an example, the base station distributed unit may receive a third context configuration request message comprising third cell configuration parameters of one or more second cells for a third wireless device based on the cell information. The one or more second cells may be different from the one or more cells. The third wireless device may be not allowed to access the first CAG (e.g., the one or more cells are a closed cell and/or a CAG cell). The third wireless device may not be a member of the first CAG (e.g., the one or more cells are a closed cell and/or a CAG cell).

In an example, the base station distributed unit may configure, based on the cell configuration parameters, the one or more cells for the wireless device. In an example, the base station distributed unit may send, to the base station central unit and in response to the context configuration request message, a context configuration response message confirming context configurations for the wireless device. The context configuration response message may be based on configuring the cell configuration parameters at the base station distributed unit. The context configuration response message comprises at least one of: a UE context setup response message and/or a UE context modification response message. The base station distributed unit may send the context configuration response message via the F1 interface. In an example, the context configuration response message may comprise at least one of: the identifier of the wireless device; a list of cells that are failed to be configured for the wireless device (e.g., based on CAG of the wireless device and/or the one or more cells; e.g., one of the one or more cells is not support the first CAG); a list of bearers that are failed to be configured for the wireless device (e.g., based on traffic load of a cell and/or the base station distributed unit); RRC parameters (e.g., configuration parameters for physical/MAC/RLC layer) for the wireless device; and/or the like.

In an example, the base station central unit may determine configuration parameters (e.g., RRC parameters) for the wireless device based on the context configuration response message. In an example, the base station central unit may transmit/send, to the wireless device, a first RRC message (e.g., RRC reconfiguration message, RRC reestablishment message, RRC setup message, RRC resume message, etc.) comprising configuration parameters (e.g., the RRC parameters for the wireless device) for the one or more cells. In an example, the base station central unit may transmit/send the first RRC message to the wireless device via the base station distributed unit (e.g., or via the second base station distributed unit). In an example, the base station distributed unit may receive, from the base station central unit, the first RRC message. The base station distributed unit may transmit/send/forward, to the wireless device, the first RRC message. In an example, the first RRC message may comprise at least one of: cell configuration parameters of the one or more cells of the base station distributed unit; bearer configuration parameters of the bearer (e.g. for the first NPN, the first network slice, the first session, etc.); and/or the like. In an example, if the configuring the one or more cells for the wireless device is for the inter-base station handover or the secondary base station addition/configuration requested from the second base station, the first RRC message may be transmitted to the wireless device via the second base station (e.g., via a handover request acknowledge message or an s-node addition/modification request acknowledge message; and/or via a handover command message or an RRC reconfiguration message).

In an example, the first RRC message may comprise at least one of: a UE identifier (e.g., TMSI, C-RNTI, IMSI, S-TMSI, IMEI, etc.) of the wireless device, a cell identifier (e.g., physical cell identifier, PCI, global cell identifier, GCI, CGI, cell index, etc.) for the wireless device, cell information (e.g., cell index, cell group configuration, radio link failure timers and constants, RLM in-sync/out-of-sync threshold, reconfiguration with sync comprising t304 value, RACH configuration parameters comprising a preamble index and/or RACH resources, carrier frequency information, bandwidth part configuration parameters, beam configuration parameters of SS beam and/or CSI-RS beam, transmission power configuration parameter comprising p-MAX/p-MgNB/p-SgNB, and/or the like) of one or more serving cells (e.g., the one or more cells) for the wireless device, a bearer identifier of the bearer associated with a service for the wireless device, a logical channel identifier (index) of the bearer, a PDU session identifier of (e.g., associated with) the bearer, a QoS flow identifier of the bearer, a network slice information (e.g., S-NSSAI, NSSAI) for a network slice (e.g., the first network slice) associated with the bearer and/or the service, an identifier of a network (e.g., the first NPN), an identifier of a CAG (e.g., the first CAG) that the wireless device is allowed to access, and/or the like. In an example, the service associated with the bearer may comprise at least one of a voice, an ultra-reliable and low-latency communication (URLLC), a vehicle-to-everything (V2X) (e.g., V2I, V2V, V2P, etc.), an emergency service, and/or the like. In an example, the service associated with the bearer may comprise at least one of a delay tolerant service, an Internet-of-things (IoT) service,

In an example, the first RRC message may comprise at least one of an rrc-transactionidentifier information element (IE), a radio resource configuration dedicated IE comprising one or more radio resource configuration parameters, measurement configuration parameters, mobility control information parameters, one or more NAS layer parameters, security parameters, antenna information parameters, secondary cell addition/modification parameters, secondary cell release parameters, WLAN configuration parameters, WLAN offloading configuration parameters, LWA configuration parameters, LWIP configuration parameters, RCLWI configuration parameters, sidelink configuration parameters, V2X configuration parameters, uplink transmission power configuration parameters (e.g. p-MAX, p-MeNB, p-SeNB), a power control mode information element, secondary cell group configuration parameters, and/or the like.

In an example, the wireless device may configure based on the configuration parameters of the first RRC message. The wireless device may transmit/send, to the base station and/or the base station central unit, a second RRC message indicating successful completion of configuring the configuration parameters for the one or more cells. The wireless device may transmit/send the second RRC message via the base station distributed unit (e.g., or via the second base station distributed unit). In an example, the base station distributed unit may receive, from the wireless device, the second RRC message. The base station distributed unit may transmit/send/forward, to the base station central unit, the second RRC message (e.g., via the F1 interface).

In an example, as shown in FIG. 22 and/or FIG. 23, the base station distributed unit may receive, from the base station central unit and based on the cell information, a paging message (e.g., a core network paging and/or a RAN paging) for a second wireless device that is allowed to access the first CAG. The paging message may comprise at least one of: an identifier of the first CAG; and/or an indication field indicating that the second wireless device is only allowed to access CAG cells (e.g., not allowed to access non-CAG cells and/or normal/open cells).

In an example, if the second wireless device is a member of the first CAG, the base station central unit may select one or more base station distributed units that serve at least one cell associated with the first CAG and/or at least one cell that is a normal cell, a non-CAG cell, or a hybrid cell associated with the other CAG that the wireless device is not a member of. In an example, if the second wireless device is a member of the first CAG and a CAG only UE (e.g., the second wireless device is only allowed to access CAG cells), the base station central unit may select one or more base station distributed units that serve at least one cell associated with the first CAG and/or at least one cell that is a hybrid cell associated with the other CAG that the wireless device is not a member of. If the second wireless device is a non-member of the first CAG, the base station central unit may select one or more base station distributed units that serve at least one cell that is a normal cell, a non-CAG cell, or a hybrid cell associated with a CAG (e.g., the first CAG). The base station central unit may send the paging message to the one or more base station distributed units selected for paging based on membership of the wireless device.

In an example, the base station distributed unit may transmit, based on the paging message, a paging indication for the second wireless device (e.g., via a cell associated with the first CAG; e.g., via the one or more cell). In an example, the base station distributed unit may receive, from the second wireless device and in response to the paging indication, at least one random access preamble (e.g., via a cell associated with the first closed access group; e.g., via the one or more cell). The wireless device may camp on the one or more cells based on the one or more cells being associated with the first CAG (e.g., based on the system information block comprising an identifier of the first CAG).

In an example, the base station distributed unit may receive/transmit transport blocks from/to the wireless device via the one or more cells and based on the cell configuration parameters. The transport blocks may be for a first network slice associated with the first closed access group. The transport blocks may be forwarded to the base station distributed unit or may be transmitted by the base station central unit.

In an example, as shown in FIG. 26, FIG. 27, FIG. 28, FIG. 29, FIG. 32, and/or FIG. 33, the base station distributed unit may receive, from the base station central unit, a configuration message comprising the cell information of the one or more cells of the base station distributed unit. In an example, the base station central unit may determine the cell information based on cell configuration information received from the AMF and/or an OAM. The cell information may indicate that the one or more cells are associated with the first CAG. The base station distributed unit may configure the one or more cells as the first CAG.

In an example, the base station distributed unit may transmit/broadcast, via the one or more cells, a system information block comprising an identifier of the first CAG. In an example, the base station distributed unit may receive a random access preamble from a wireless device (e.g., a member of the first CAG; or a non-member of the first CAG if the one or more cells are a hybrid cell) that is allowed to access the first closed access group (e.g., via the one or more cells and/or based on the system information block). The configuration message may comprise the system information block. The base station distributed unit may receive, from the base station central unit, the context configuration request message comprising the cell configuration parameters of the one or more cells for the wireless device based on the cell information. The wireless device may be allowed to access the first CAG. The base station distributed unit may configure the one or more cells for the wireless device based on the cell information and/or the context configuration request message. The base station distributed unit may receive, from the base station central unit, the paging message for the second wireless device based on the cell information. The base station distributed unit may transmit a paging indication (e.g., associated with the paging message) for the wireless device based on the cell information and/or the paging message.

In an example, as shown in FIG. 30 and/or FIG. 31, a base station distributed unit may send, to a base station central unit, a configuration request message comprising cell information of one or more cells of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group. The base station distributed unit may receive a response message for the configuration request message. The base station distributed unit may receive a context configuration request message comprising cell configuration parameters of the one or more cells for a wireless device based on the cell information. The wireless device be allowed to access the first closed access group.

In an example, the base station distribute unit may comprise at least one of: a radio link control (RLC) layer function; a medium access control (MAC) layer function; a physical layer function; and/or a part of a physical layer function. The base station distribute unit may be an integrated access and backhaul (IAB) node. The base station central unit may comprise at least one of: an RRC function; a service data adaptation protocol (SDAP) layer function; a packet data convergence protocol (PDCP) layer function; an RLC layer function; a MAC layer function; and/or a part of a physical layer function. The base station central unit may be an IAB donor. A base station may comprise the base station central unit and the base station distributed unit.

In an example, the configuration request message may comprise at least one of: an F1 message, an F1 setup request message; a base station distributed unit configuration update message; and/or a base station central unit configuration update acknowledge message. In an example, the cell information of the one or more cells may further indicate whether a second wireless device that is a non-member of the first closed access group is allowed to access a cell (e.g., closed cell or hybrid cell) of the one or more cells. The cell information may comprise a physical cell identifier (PCI) indicating the cell of the one or more cells. The physical cell identifier may further indicate whether the second wireless device that is a non-member of the first closed access group is allowed to access the cell (e.g., closed cell or hybrid cell) of the one or more cells. The cell of the one or more cells may be at least one of a closed cell and/or a hybrid cell. In an example, the base station distribute unit may receive a second context configuration request message comprising second cell configuration parameters of the one or more cells for the second wireless device based on the cell information.

In an example, the one or more cells may belong to the first closed access group. The one or more cells may be further associated with a second closed access group. The second closed access group may be associated with at least one of: a second non-public network (NPN), a second network slice, and/or a second public land mobile network (PLMN). The first closed access group may be associated with at least one of a first NPN, a first network slice, and/or a first PLMN.

In an example, the response message may comprise at least one of: an F1 message, an F1 setup response message, and/or a base station distributed unit configuration update acknowledge message. The response message may comprise a system information block (SIB) for at least one of the one or more cells. The system information block may comprise an identifier of the first closed access group. The base station distributed unit may transmit/broadcast the system information block to one or more wireless devices (e.g., via cells (e.g., the one or more cells) associated with the first closed access group). The system information block may further comprise at least one of: a network identifier of a first NPN associated with the first closed access group; a first network slice selection assistance information (NSSAI) of a first network slice associated with the first closed access group; and/or a first identifier of a first PLMN associated with the first closed access group. The cell information and/or the system information block may further comprise one or more cell identifiers of the one or more cells.

In an example, the context configuration request message may comprise at least one of: a user equipment (UE) context setup request message; a UE context modification request message; and/or a UE context modification confirm message. The context configuration request message may comprise bearer configuration parameters of one or more bearers for a first network slice associated with the first closed access group. The cell configuration parameters may comprise an information element indicating that a cell of the one or more cells is configured as a primary cell or a secondary cell for the wireless device. The information element of the cell configuration parameters may comprise at least one of: a cell identifier of the cell; a cell index of the cell; uplink configuration information (e.g., indicating the cell is configured with at least one of none uplink, a supplementary uplink, and/or a normal uplink); and/or a serving cell measurement object (e.g., measurement object identifier, servingCellMO). In an example, the cell configuration parameters may comprise at least one cell identifier of at least one candidate special cell for the wireless device. The at least one candidate special cell may be associated with the first closed access group.

In an example, as shown in FIG. 20 and/or FIG. 21, the base station central unit may receive, from a second base station, a handover request message for the wireless device. The context configuration request message may be based on the handover request message. In an example, as shown in FIG. 20 and/or FIG. 21, the base station central unit may receive, from a second base station, a secondary node configuration request message for the wireless device. The context configuration request message may be based on the secondary node configuration request message.

In an example, the base station distributed unit may receive a third context configuration request message comprising third cell configuration parameters of one or more second cells for a third wireless device based on the cell information. The one or more second cells may be different from the one or more cells. The third wireless device may be not allowed to access the first closed access group. In an example, the wireless device may be a member of the first closed access group.

In an example, the base station distributed unit may configure, based on the cell configuration parameters, the one or more cells for the wireless device. The base station distributed unit may send, to the base station central unit and in response to the context configuration request message, a context configuration response message confirming context configurations for the wireless device. The context configuration response message comprises at least one of: a UE context setup response message and/or a UE context modification response message.

In an example, the base station distributed unit may receive, from the base station central unit, a first RRC message (e.g., RRC reconfiguration message, RRC reestablishment message, RRC setup message, RRC resume message, etc.) comprising configuration parameters for the one or more cells. The base station distributed unit may transmit/send/forward, to the wireless device, the first RRC message. In an example, the base station distributed unit may receive, from the wireless device, a second RRC message indicating successful completion of configuring the configuration parameters for the one or more cells. The base station distributed unit may transmit/send/forward, to the base station central unit, the second RRC message.

In an example, the base station central unit may send, to an access and mobility management function (AMF) and based on the cell information, a second configuration request message comprising second cell information of a base station comprising the base station central unit. The second cell information may comprise an identifier of the first closed access group. The base station central unit may receive, from the AMF, a second response message for the second configuration request message. The second cell information may further indicate whether a second wireless device that is a non-member of the first closed access group is allowed to access a cell (e.g., a closed cell or a hybrid cell) associated with the first closed access group. The cell associated with the first closed access group may be a serving cell of the base station. The cell may be one of the one or more cells of the base station distributed unit.

In an example, the base station distributed unit may receive, from the base station central unit and based on the cell information, a paging message (e.g., a core network paging and/or a RAN paging) for a second wireless device that is allowed to access the first closed access group. The paging message may comprise at least one of: an identifier of the first closed access group; and/or an indication field indicating that the second wireless device is only allowed to access CAG cells (e.g., not allowed to access non-CAG cells and/or normal/open cells). The base station distributed unit may transmit, based on the paging message, a paging indication for the second wireless device (e.g., via a cell associated with the first closed access group; e.g., via the one or more cell).

In an example, the base station distributed unit may receive/transmit transport blocks from/to the wireless device via the one or more cells and based on the cell configuration parameters. The transport blocks may be for a first network slice associated with the first closed access group.

In an example, the base station distributed unit (e.g., IAB-node) may select the base station central unit (e.g., IAB-donor) based on the base station central unit being supporting the first closed access group. The sending the configuration request message to the base station central unit may be based on the selecting the base station central unit (e.g., IAB-donor) based on the base station central unit being supporting the first closed access group. The base station distributed unit may receive, from the base station central unit, a system information block comprising an identifier of the first closed access group. The selecting the base station central unit may be based on the system information block.

In an example, a base station central unit may receive, from a base station distributed unit, a configuration request message comprising cell information of one or more cells of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group. The base station central unit may send, to the base station distributed unit, a response message for the configuration request message. The base station central unit may determine, based on the cell information, cell configuration parameters of the one or more cells for a wireless device. The wireless device may be allowed to access the first closed access group. The base station central unit may send, to the base station distributed unit, a context configuration request message comprising the cell configuration parameters.

In an example, a base station distributed unit may send, to a base station central unit, a configuration request message comprising cell information of one or more cells of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group. The base station distributed unit may receive, from the base station central unit, a response message for the configuration request message. The base station distributed unit may receive, based on the cell information, a paging message for a wireless device. The wireless device may be allowed to access the first closed access group. The base station distributed unit may transmit, in response to receiving the paging message, a paging indication for the wireless device.

In an example, a base station central unit may receive, from a base station distributed unit, a configuration request message comprising cell information of one or more cells of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group. The base station central unit may send, to the base station distributed unit, a response message for the configuration request message. The base station central unit may determine, based on the cell information, to send a paging message to the base station distributed unit for a wireless device. The wireless device may be allowed to access the first closed access group. The base station central unit may send, to the base station distributed unit, the paging message for the wireless device. The base station central unit may receive, from a second base station distributed unit, a second configuration request message comprising second cell information of one or more second cells (e.g. all serving cells) of the second base station distributed unit. The second cell information may indicate that the one or more second cells are not associated with the first closed access group (e.g., associated with a second closed access group). The base station central unit may determine, based on the second cell information, to not send a paging message to the second base station distributed unit for the wireless device.

In an example, as shown in FIG. 26, FIG. 28, FIG. 32, and/or FIG. 33, a base station distributed unit may receive, from a base station central unit, a configuration message comprising cell information of one or more cells of the base station distributed unit. The cell information may indicate that the one or more cells are associated with a first closed access group. The base station distributed unit may configure the one or more cells as the first closed access group. The base station distributed unit may transmit/broadcast, via the one or more cells, a system information block comprising an identifier of the first closed access group. In an example, the base station distributed unit may receive a random access preamble from a wireless device that is allowed to access the first closed access group (e.g., via the one or more cells and/or based on the system information block). The configuration message may comprise the system information block. The base station distributed unit may receive, from the base station central unit, a context configuration request message comprising cell configuration parameters of the one or more cells for a wireless device based on the cell information. The wireless device may be allowed to access the first closed access group.

FIG. 34 is an example diagram of an aspect of an embodiment of the present disclosure. At 3410, a base station central unit receives, from a base station distributed unit, an indication that one or more cells are associated with a first closed access group. The indication may be a message comprising one or more parameters of the base station distributed unit. The one or more parameters may indicate that the one or more cells are associated with the first closed access group. At 3420, the base station central unit determines, based on the indication, cell configuration parameters of the one or more cells for a wireless device. The wireless device may be a wireless device that is allowed to access the first closed access group. At 3430, the base station central unit sends, to the base station distributed unit, a context configuration message. The context configuration message may comprise the cell configuration parameters.

In an example, the base station central unit may receive, from a second base station, a handover request message for the wireless device indicating that the wireless device is allowed to access the first closed access group. The context configuration message may be based on the handover request message.

In an example, the base station central unit may receive, from the wireless device, a radio resource control, RRC, request message for the wireless device indicating that the wireless device is allowed to access the first closed access group. The context configuration message may be based on the RRC request message.

In an example, the base station central unit receives, from an access and mobility management function, a wireless device context configuration request message for the wireless device indicating that the wireless device is allowed to access the first closed access group. The context configuration message is based on the wireless device context configuration request message.

In an example, a base station central unit comprises the base station central unit and the base station distributed unit.

In an example, the message comprises an F1 setup request message. In an example, the message comprises a base station distributed unit configuration update message. In an example, the message comprises a base station central unit configuration update acknowledge message.

In an example, the one or more parameters indicate whether a non-member of the first closed access group is allowed to access the one or more cells.

In an example, the first closed access group is associated with a first non-public network. In an example, the first closed access group is associated with a first network slice. In an example, the first closed access group is associated with a first public land mobile network (PLMN).

In an example, the base station central unit receives, from the base station central unit, a response message for the message. In an example, the response message comprises an F1 setup response message. In an example, the response message comprises a base station distributed unit configuration update acknowledge message.

In an example, the base station central unit sends, to the base station distributed unit, a system information block for at least one of the one or more cells, the system information block comprising an identifier of the first closed access group.

In an example, the base station central unit sends, to the base station distributed unit, a second context configuration message. The second context configuration message may comprise second cell configuration parameters of one or more second cells for a second wireless device. The sending of the second context configuration message may be based on the message. The one or more second cells may not comprise the one or more cells. The second wireless device may not be allowed to access the first closed access group.

In an example, the base station central unit receives, from the base station distributed unit a context configuration response message confirming context configurations for the wireless device. The receiving may be in response to the context configuration message.

In an example, the base station central unit sends, to the wireless device via the base station distributed unit, a radio resource control, RRC, message comprising RRC configuration parameters of the one or more cells for the wireless device.

In an example, the base station central unit sends, to the base station distributed unit and based on the one or more parameters, a paging message for a second wireless device that is allowed to access the first closed access group.

In an example, the base station central unit sends, to the base station distributed unit, an identifier of the first closed access group, the identifier indicating that the base station central unit supports the first closed access group.

FIG. 35 is an example diagram of an aspect of an embodiment of the present disclosure. At 3510, a base station distributed unit sends, to a base station central unit, an indication that one or more cells are associated with a first closed access group. The indication may be a list of the one or more cells that are associated with a first closed access group. The indication may be a message comprising one or more parameters of the base station distributed unit. The one or more parameters may indicate that the one or more cells are associated with the first closed access group. At 3520, the base station distributed unit receives, from the base station central unit, a context configuration message comprising cell configuration parameters of the one or more cells. The one or more cells may be for a wireless device. The wireless device may be allowed to access the first closed access group. The context configuration message may be based on the message.

In an example, the base station distributed unit comprises a radio link control layer. In an example, the base station distributed unit comprises a medium access control layer. In an example, the base station distributed unit comprises a physical layer. In an example, the base station distributed unit comprises a part of the physical layer. In an example, the base station distributed unit is an integrated access and backhaul node.

In an example, the base station central unit comprises a radio resource control layer. In an example, the base station central unit comprises a service data adaptation protocol layer. In an example, the base station central unit comprises a packet data convergence protocol layer. In an example, the base station central unit comprises a radio link control layer. In an example, the base station central unit comprises a medium access control layer. In an example, the base station central unit comprises a part of a physical layer. In an example, the base station central unit is an integrated access and backhaul donor.

In an example, a base station comprises the base station central unit and the base station distributed unit.

In an example, the message comprises an F1 setup request message. In an example, the message comprises a base station distributed unit configuration update message. In an example, the message comprises a base station central unit configuration update acknowledge message.

In an example, the one or more parameters indicates whether a non-member of the first closed access group is allowed to access the one or more cells. In an example, the one or more parameters comprises a physical cell identifier indicating a cell of the one or more cells. In an example, the one or more parameters comprises a physical cell identifier indicating whether a non-member of the first closed access group is allowed to access the cell of the one or more cells.

In an example, the one or more cells are at least one of a closed cell or a hybrid cell. In an example, the one or more cells are further associated with a second closed access group.

In an example, the first closed access group is associated with a first non-public network. In an example, the first closed access group is associated with a first network slice. In an example, the first closed access group is associated with a first public land mobile network (PLMN).

In an example, the base station distributed unit receives, from the base station central unit, a response message for the message. In an example, the response message comprises an F1 setup response message. In an example, the response message comprises a base station distributed unit configuration update acknowledge message.

In an example, the base station distributed unit receives, from the base station central unit, a system information block for at least one of the one or more cells. The system information block may comprise an identifier of the first closed access group. In an example, the base station distributed unit transmits the system information block to one or more wireless devices. In an example, the system information block comprises a network identifier of a first non-public network associated with the first closed access group. In an example, the system information block comprises a first network slice selection assistance information (NSSAI) of a first network slice associated with the first closed access group. In an example, the system information block comprises a first identifier of a first public land mobile network (PLMN) associated with the first closed access group.

In an example, the context configuration message comprises a user equipment context setup request message. In an example, the context configuration message comprises a user equipment context modification request message. In an example, the context configuration message comprises a user equipment context modification confirm message. In an example, the context configuration message comprises an identifier of the first closed access group. In an example, the context configuration message comprises bearer configuration parameters of one or more bearers for a first network slice associated with the first closed access group.

In an example, the cell configuration parameters comprise at least one cell identifier of at least one candidate special cell for the wireless device. The at least one candidate special cell may be associated with the first closed access group.

In an example, the base station central unit receives, from a second base station, a handover request message for the wireless device, wherein the context configuration message is based on the handover request message.

In an example, the base station central unit receives, from a second base station, a secondary node configuration request message for the wireless device. The context configuration message may be based on the secondary node configuration request message.

In an example, the base station distributed unit receives a second context configuration message. The second context configuration message may comprise second cell configuration parameters of one or more second cells for a second wireless device. The one or more second cells may not comprise the one or more cells. The second wireless device may not be allowed to access the first closed access group.

In an example, the wireless device is a member of the first closed access group.

In an example, the base station distributed unit configures, based on the cell configuration parameters, the one or more cells for the wireless device. In an example, the base station distributed unit sends, to the base station central unit and in response to the context configuration message, a context configuration response message confirming context configurations for the wireless device. In an example, the context configuration response message comprises a user equipment context setup response message. In an example, the context configuration response message comprises a user equipment context modification response message.

In an example, the base station distributed unit receives, from the base station central unit, a radio resource control (RRC) message comprising RRC configuration parameters of the one or more cells for the wireless device. In an example, the base station distributed unit sends, to the wireless device, the RRC message.

In an example, the base station distributed unit receives, from the wireless device, an RRC complete message indicating successful completion of configuring the RRC configuration parameters of the one or more cells. In an example, the base station distributed unit sends, to the base station central unit, the RRC complete message.

In an example, the base station central unit sends, to an access and mobility management function and based on the one or more parameters, a second configuration message comprising cell information of a base station comprising the base station central unit. The cell information may comprise an identifier of the first closed access group. In an example, the base station central unit receives a second configuration response message for the second configuration message.

In an example, the cell information indicates whether a non-member of the first closed access group is allowed to access a cell associated with the first closed access group, the cell being a serving cell of the base station.

In an example, the base station distributed unit receives, from the base station central unit and based on the one or more parameters, a paging message for a second wireless device that is allowed to access the first closed access group. In an example, the paging message comprises an identifier of the first closed access group. In an example, the paging message comprises a field indicating whether the second wireless device is only allowed to access closed access group cells. In an example, the base station distributed unit transmits, based on the paging message, a paging indication for the second wireless device. In an example, the transmitting the paging indication comprises transmitting the paging indication via the one or more cells associated with the first closed access group.

In an example, the base station distributed unit receives, from the wireless device, transport blocks via the one or more cells and based on the cell configuration parameters. In an example, the base station distributed unit transmits, to the wireless device, transport blocks via the one or more cells and based on the cell configuration parameters.

In an example, the base station distributed unit selects the base station central unit based on the base station central unit supporting the first closed access group, wherein the sending the message is based on the selecting.

In an example, the base station distributed unit receives, from the base station central unit, an identifier of the first closed access group, wherein the selecting the base station central unit is based on the identifier of the first closed access group.

FIG. 36 is an example diagram of an aspect of an embodiment of the present disclosure. At 3610, a base station central unit receives, an indication that one or more cells are associated with a first closed access group. The indication may be a list of the one or more cells that are associated with a first closed access group. The indication may be a message comprising one or more parameters of the base station distributed unit. The one or more parameters may indicate that the one or more cells are associated with the first closed access group. At 3620, the base station central unit determines to send a paging message to a wireless device. The wireless device may be allowed to access the first closed access group. At 3630, the base station central unit selects the base station distributed unit, based on the indication, for transmission of the paging message. At 3640, the base station central unit sends, to the base station distributed unit, the paging message for the wireless device.

In an example, the base station central unit receives, from an access and mobility management function, a core paging message for the wireless device. The core paging message may indicate the first closed access group. The sending the paging message to the base station distributed unit may be in response to the core paging message.

In an example, the base station central unit receives, from a second base station distributed unit, a second message comprising one or more second parameters of the second base station distributed unit. The one or more second parameters indicate that any of one or more second cells of the second base station distributed unit are not associated with the first closed access group.

In an example, the base station central unit determines, based on the second message, to not send a second paging message to the second base station distributed unit for the wireless device. The second paging message may be in response to the core paging message.

FIG. 37 is an example diagram of an aspect of an embodiment of the present disclosure. At 3710, a base station distributed unit sends, to a base station central unit, an indication that one or more cells are associated with a first closed access group. The indication may be a list of the one or more cells that are associated with a first closed access group. The indication may be a message comprising one or more parameters of the base station distributed unit. The one or more parameters may indicate that the one or more cells are associated with the first closed access group. At 3720, the base station distributed unit receives, from the base station central unit, a paging message for a wireless device that is allowed to access the first closed access group.

In an example, the base station distributed unit transmits, in response to receiving the paging message, a paging indication for the wireless device. In an example, the transmitting the paging indication comprises transmitting the paging indication via the one or more cells associated with the first closed access group.

In an example, the base station distributed unit receives, from the base station central unit, a response message for the message.

In an example, the paging message indicates the first closed access group.

FIG. 38 is an example diagram of an aspect of an embodiment of the present disclosure At 3810, a base station distributed unit receives, from a base station central unit, an indication that one or more cells are associated with a first closed access group. The indication may be a list of the one or more cells that are associated with a first closed access group. The indication may be a message comprising one or more parameters of the base station distributed unit. The one or more parameters may indicate that the one or more cells are associated with the first closed access group. At 3820, the base station distributed unit configures the one or more cells as the first closed access group. At 3830, the base station distributed unit transmits, via the one or more cells, a system information block comprising an identifier of the first closed access group.

In an example, the message comprises a system information block.

In an example, the base station distributed unit receives, from a wireless device via the one or more cells, a random access preamble based on the system information block

In an example, the wireless device is allowed to access the first closed access group.

In an example, the base station distributed unit receives, from the base station central unit, a context configuration message comprising cell configuration parameters of the one or more cells for the wireless device. The cell configuration parameters may be based on the wireless device being allowed to access the first closed access group. The cell configuration parameters may be based on the one or more cells being associated with the first closed access group.

Embodiments may be configured to operate as needed. The disclosed mechanism may be performed when certain criteria are met, for example, in a wireless device, a base station, a radio environment, a network, a combination of the above, and/or the like. Example criteria may be based, at least in part, on for example, wireless device or network node configurations, traffic load, initial system set up, packet sizes, traffic characteristics, a combination of the above, and/or the like. When the one or more criteria are met, various example embodiments may be applied. Therefore, it may be possible to implement example embodiments that selectively implement disclosed protocols.

A base station may communicate with a mix of wireless devices. Wireless devices and/or base stations may support multiple technologies, and/or multiple releases of the same technology. Wireless devices may have some specific capability(ies) depending on wireless device category and/or capability(ies). A base station may comprise multiple sectors. When this disclosure refers to a base station communicating with a plurality of wireless devices, this disclosure may refer to a subset of the total wireless devices in a coverage area. This disclosure may refer to, for example, a plurality of wireless devices of a given LTE or 5G release with a given capability and in a given sector of the base station. The plurality of wireless devices in this disclosure may refer to a selected plurality of wireless devices, and/or a subset of total wireless devices in a coverage area which perform according to disclosed methods, and/or the like. There may be a plurality of base stations or a plurality of wireless devices in a coverage area that may not comply with the disclosed methods, for example, because those wireless devices or base stations perform based on older releases of LTE or 5G technology.

In this disclosure, “a” and “an” and similar phrases are to be interpreted as “at least one” and “one or more.” Similarly, any term that ends with the suffix “(s)” is to be interpreted as “at least one” and “one or more.” In this disclosure, the term “may” is to be interpreted as “may, for example.” In other words, the term “may” is indicative that the phrase following the term “may” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments.

If A and B are sets and every element of A is also an element of B, A is called a subset of B. In this specification, only non-empty sets and subsets are considered. For example, possible subsets of B={cell1, cell2} are: {cell1}, {cell2}, and {cell1, cell2}. The phrase “based on” (or equally “based at least on”) is indicative that the phrase following the term “based on” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments. The phrase “in response to” (or equally “in response at least to”) is indicative that the phrase following the phrase “in response to” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments. The phrase “depending on” (or equally “depending at least to”) is indicative that the phrase following the phrase “depending on” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments. The phrase “employing/using” (or equally “employing/using at least”) is indicative that the phrase following the phrase “employing/using” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments.

The term configured may relate to the capacity of a device whether the device is in an operational or non-operational state. Configured may also refer to specific settings in a device that effect the operational characteristics of the device whether the device is in an operational or non-operational state. In other words, the hardware, software, firmware, registers, memory values, and/or the like may be “configured” within a device, whether the device is in an operational or nonoperational state, to provide the device with specific characteristics. Terms such as “a control message to cause in a device” may mean that a control message has parameters that may be used to configure specific characteristics or may be used to implement certain actions in the device, whether the device is in an operational or non-operational state

In this disclosure, various embodiments are disclosed. Limitations, features, and/or elements from the disclosed example embodiments may be combined to create further embodiments within the scope of the disclosure.

In this disclosure, parameters (or equally called, fields, or Information elements: IEs) may comprise one or more information objects, and an information object may comprise one or more other objects. For example, if parameter (IE) N comprises parameter (IE) M, and parameter (IE) M comprises parameter (IE) K, and parameter (IE) K comprises parameter (information element) J. Then, for example, N comprises K, and N comprises J. In an example embodiment, when one or more messages comprise a plurality of parameters, it implies that a parameter in the plurality of parameters is in at least one of the one or more messages, but does not have to be in each of the one or more messages.

Furthermore, many features presented above are described as being optional through the use of “may” or the use of parentheses. For the sake of brevity and legibility, the present disclosure does not explicitly recite each and every permutation that may be obtained by choosing from the set of optional features. However, the present disclosure is to be interpreted as explicitly disclosing all such permutations. For example, a system described as having three optional features may be embodied in seven different ways, namely with just one of the three possible features, with any two of the three possible features or with all three of the three possible features.

Many of the elements described in the disclosed embodiments may be implemented as modules. A module is defined here as an element that performs a defined function and has a defined interface to other elements. The modules described in this disclosure may be implemented in hardware, software in combination with hardware, firmware, wetware (i.e. hardware with a biological element) or a combination thereof, all of which may be behaviorally equivalent. For example, modules may be implemented as a software routine written in a computer language configured to be executed by a hardware machine (such as C, C++, Fortran, Java, Basic, Matlab or the like) or a modeling/simulation program such as Simulink, Stateflow, GNU Octave, or LabVIEWMathScript. Additionally, it may be possible to implement modules using physical hardware that incorporates discrete or programmable analog, digital and/or quantum hardware. Examples of programmable hardware comprise: computers, microcontrollers, microprocessors, application-specific integrated circuits (ASICs); field programmable gate arrays (FPGAs); and complex programmable logic devices (CPLDs). Computers, microcontrollers and microprocessors are programmed using languages such as assembly, C, C++ or the like. FPGAs, ASICs and CPLDs are often programmed using hardware description languages (HDL) such as VHSIC hardware description language (VHDL) or Verilog that configure connections between internal hardware modules with lesser functionality on a programmable device. The above mentioned technologies are often used in combination to achieve the result of a functional module.

The disclosure of this patent document incorporates material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, for the limited purposes required by law, but otherwise reserves all copyright rights whatsoever.

While various embodiments have been described above, it should be understood that they have been presented by way of example, and not limitation. It will be apparent to persons skilled in the relevant art(s) that various changes in form and detail can be made therein without departing from the scope. In fact, after reading the above description, it will be apparent to one skilled in the relevant art(s) how to implement alternative embodiments. Thus, the present embodiments should not be limited by any of the above described exemplary embodiments.

In addition, it should be understood that any figures which highlight the functionality and advantages, are presented for example purposes only. The disclosed architecture is sufficiently flexible and configurable, such that it may be utilized in ways other than that shown. For example, the actions listed in any flowchart may be re-ordered or only optionally used in some embodiments.

Further, the purpose of the Abstract of the Disclosure is to enable the U.S. Patent and Trademark Office and the public generally, and especially the scientists, engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The Abstract of the Disclosure is not intended to be limiting as to the scope in any way.

Finally, it is the applicant's intent that only claims that include the express language “means for” or “step for” be interpreted under 35 U.S.C. 112. Claims that do not expressly include the phrase “means for” or “step for” are not to be interpreted under 35 U.S.C. 112. 

What is claimed is:
 1. A method comprising: receiving, by a base station central unit from a base station distributed unit, a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that one or more cells are associated with a first closed access group; determining, based on the message, cell configuration parameters of the one or more cells for a wireless device that is allowed to access the first closed access group; and sending, to the base station distributed unit, a context configuration message comprising the cell configuration parameters.
 2. The method of claim 1, further comprising receiving, by the base station central unit from a second base station, a handover request message for the wireless device indicating that the wireless device is allowed to access the first closed access group, wherein the context configuration message is based on the handover request message.
 3. The method of claim 1, further comprising receiving, by the base station central unit from the wireless device, a radio resource control, RRC, request message for the wireless device indicating that the wireless device is allowed to access the first closed access group, wherein the context configuration message is based on the RRC request message.
 4. The method of claim 1, further comprising receiving, by the base station central unit from an access and mobility management function, a wireless device context configuration request message for the wireless device indicating that the wireless device is allowed to access the first closed access group, wherein the context configuration message is based on the wireless device context configuration request message.
 5. The method of any one of claims 1 to 4, wherein a base station comprises the base station central unit and the base station distributed unit.
 6. The method of any one of claims 1 to 5, wherein the message comprises at least one of: an F1 setup request message; a base station distributed unit configuration update message; or a base station central unit configuration update acknowledge message.
 7. The method of any one of claims 1 to 6, wherein the one or more parameters indicate whether a non-member of the first closed access group is allowed to access the one or more cells.
 8. The method of any one of claims 1 to 7, wherein the first closed access group is associated with at least one of: a first non-public network; a first network slice; or a first public land mobile network (PLMN).
 9. The method of any one of claims 1 to 8, further comprising receiving, by the base station distributed unit from the base station central unit, a response message for the message.
 10. The method of claim 9, wherein the response message comprises at least one of: an F1 setup response message; or a base station distributed unit configuration update acknowledge message.
 11. The method of any one of claims 1 to 10, further comprising sending, by the base station central unit to the base station distributed unit, a system information block for at least one of the one or more cells, the system information block comprising an identifier of the first closed access group.
 12. The method of any one of claims 1 to 11, further comprising sending, by the base station central unit to the base station distributed unit, a second context configuration message comprising second cell configuration parameters of one or more second cells for a second wireless device based on the message, wherein: the one or more second cells do not comprise the one or more cells; and the second wireless device is not allowed to access the first closed access group.
 13. The method of any one of claims 1 to 12, further comprising receiving, by the base station central unit from the base station distributed unit and in response to the context configuration message, a context configuration response message confirming context configurations for the wireless device.
 14. The method of any one of claims 1 to 13, further comprising sending, by the base station central unit to the wireless device via the base station distributed unit, a radio resource control, RRC, message comprising RRC configuration parameters of the one or more cells for the wireless device.
 15. The method of any one of claims 1 to 14, further comprising sending, by the base station central unit to the base station distributed unit and based on the one or more parameters, a paging message for a second wireless device that is allowed to access the first closed access group.
 16. The method of any one of claims 1 to 15, further comprising sending, by the base station central unit to the base station distributed unit, an identifier of the first closed access group, the identifier indicating that the base station central unit supports the first closed access group.
 17. A method comprising: receiving, by a base station central unit from a base station distributed unit, an indication that one or more cells are associated with a first closed access group; determining, based on the indication, cell configuration parameters of the one or more cells for a wireless device that is allowed to access the first closed access group; and sending, to the base station distributed unit, a context configuration message comprising the cell configuration parameters.
 18. The method of claim 17, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 19. A base station central unit comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station central unit to perform the method of any one of claims 1 to
 18. 20. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 1 to
 18. 21. A method comprising: sending, by a base station distributed unit to a base station central unit, a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that one or more cells are associated with a first closed access group; and receiving, from the base station central unit, a context configuration message comprising cell configuration parameters of the one or more cells for a wireless device, wherein the context configuration message is based on the message.
 22. The method of claim 21, wherein the wireless device is allowed to access the first closed access group.
 23. The method of any one of claims 21 to 22, wherein the base station distributed unit comprises at least one of: a radio link control layer; a medium access control layer; a physical layer; or a part of the physical layer.
 24. The method of any one of claims 21 to 23, wherein the base station distributed unit is an integrated access and backhaul node.
 25. The method of any one of claims 21 to 24, wherein the base station central unit comprises at least one of: a radio resource control layer; a service data adaptation protocol layer; a packet data convergence protocol layer; a radio link control layer; a medium access control layer; or a part of a physical layer.
 26. The method of any one of claims 21 to 25, wherein the base station central unit is an integrated access and backhaul donor.
 27. The method of any one of claims 21 to 26, wherein a base station comprises the base station central unit and the base station distributed unit.
 28. The method of any one of claims 21 to 27, wherein the message comprises at least one of: an F1 setup request message; a base station distributed unit configuration update message; or a base station central unit configuration update acknowledge message.
 29. The method of any one of claims 21 to 28, wherein the one or more parameters indicates whether a non-member of the first closed access group is allowed to access the one or more cells.
 30. The method of any one of claims 21 to 29, wherein the one or more parameters comprises a physical cell identifier indicating: a cell of the one or more cells; and whether a non-member of the first closed access group is allowed to access the cell of the one or more cells.
 31. The method of any one of claims 21 to 30, wherein the one or more cells are at least one of: a closed cell; or a hybrid cell.
 32. The method of any one of claims 21 to 31, wherein the one or more cells are further associated with a second closed access group.
 33. The method of any one of claims 21 to 32, wherein the first closed access group is associated with at least one of: a first non-public network; a first network slice; or a first public land mobile network (PLMN).
 34. The method of any one of claims 21 to 33, further comprising receiving, by the base station distributed unit from the base station central unit, a response message for the message.
 35. The method of claim 34, wherein the response message comprises at least one of: an F1 setup response message; or a base station distributed unit configuration update acknowledge message.
 36. The method of any one of claims 21 to 35, further comprising receiving, by the base station distributed unit from the base station central unit, a system information block for at least one of the one or more cells, the system information block comprising an identifier of the first closed access group.
 37. The method of claim 36, further comprising transmitting, by the base station distributed unit, the system information block to one or more wireless devices.
 38. The method of any one of claims 36 to 37, wherein the system information block comprises at least one of: a network identifier of a first non-public network associated with the first closed access group; a first network slice selection assistance information (NSSAI) of a first network slice associated with the first closed access group; or a first identifier of a first public land mobile network (PLMN) associated with the first closed access group.
 39. The method of any one of claims 21 to 38, wherein the context configuration message comprises at least one of: a user equipment context setup request message; a user equipment context modification request message; or a user equipment context modification confirm message.
 40. The method of any one of claims 21 to 39, wherein the context configuration message comprises an identifier of the first closed access group.
 41. The method of any one of claims 21 to 40, wherein the context configuration message comprises bearer configuration parameters of one or more bearers for a first network slice associated with the first closed access group.
 42. The method of any one of claims 21 to 41, wherein the cell configuration parameters comprise at least one cell identifier of at least one candidate special cell for the wireless device, the at least one candidate special cell being associated with the first closed access group.
 43. The method of any one of claims 21 to 42, further comprising receiving, by the base station central unit from a second base station, a handover request message for the wireless device, wherein the context configuration message is based on the handover request message.
 44. The method of any one of claims 21 to 43, further comprising receiving, by the base station central unit from a second base station, a secondary node configuration request message for the wireless device, wherein the context configuration message is based on the secondary node configuration request message.
 45. The method of any one of claims 21 to 44, further comprising receiving, by the base station distributed unit, a second context configuration message comprising second cell configuration parameters of one or more second cells for a second wireless device based on the message, wherein: the one or more second cells do not comprise the one or more cells; and the second wireless device is not allowed to access the first closed access group.
 46. The method of any one of claims 21 to 45, wherein the wireless device is a member of the first closed access group.
 47. The method of any one of claims 21 to 46, further comprising: configuring, by the base station distributed unit and based on the cell configuration parameters, the one or more cells for the wireless device; and sending, by the base station distributed unit to the base station central unit and in response to the context configuration message, a context configuration response message confirming context configurations for the wireless device.
 48. The method of claim 47, wherein the context configuration response message comprises at least one of: a user equipment context setup response message; or a user equipment context modification response message.
 49. The method of any one of claims 21 to 48, further comprising: receiving, by the base station distributed unit from the base station central unit, a radio resource control (RRC) message comprising RRC configuration parameters of the one or more cells for the wireless device; and sending, by the base station distributed unit to the wireless device, the RRC message.
 50. The method of claim 49, further comprising: receiving, by the base station distributed unit from the wireless device, an RRC complete message indicating successful completion of configuring the RRC configuration parameters of the one or more cells; and sending, by the base station distributed unit to the base station central unit, the RRC complete message.
 51. The method of any one of claims 21 to 50, further comprising: sending, by the base station central unit to an access and mobility management function and based on the one or more parameters, a second configuration message comprising cell information of a base station comprising the base station central unit, wherein the cell information comprises an identifier of the first closed access group; and receiving, by the base station central unit, a second configuration response message for the second configuration message.
 52. The method of claim 51, wherein the cell information indicates whether a non-member of the first closed access group is allowed to access a cell associated with the first closed access group, the cell being a serving cell of the base station.
 53. The method of any one of claims 21 to 52, further comprising receiving, by the base station distributed unit from the base station central unit and based on the one or more parameters, a paging message for a second wireless device that is allowed to access the first closed access group.
 54. The method of claim 53, wherein the paging message comprises at least one of: an identifier of the first closed access group; or a field indicating whether the second wireless device is only allowed to access closed access group cells.
 55. The method of claim 54, further transmitting, by the base station distributed unit and based on the paging message, a paging indication for the second wireless device.
 56. The method of claim 54, wherein the transmitting the paging indication comprises transmitting the paging indication via the one or more cells associated with the first closed access group.
 57. The method of any one of claims 21 to 56, further comprising: receiving, by the base station distributed unit from the wireless device, transport blocks via the one or more cells and based on the cell configuration parameters; or transmitting, by the base station distributed unit to the wireless device, transport blocks via the one or more cells and based on the cell configuration parameters.
 58. The method of any one of claims 21 to 57, further comprising selecting, by the base station distributed unit, the base station central unit based on the base station central unit supporting the first closed access group, wherein the sending the message is based on the selecting.
 59. The method of claim 58, further comprising receiving, by the base station distributed unit from the base station central unit, an identifier of the first closed access group, wherein the selecting the base station central unit is based on the identifier of the first closed access group.
 60. The method of any one of claims 21 to 59, wherein the one or more parameters indicate a list of one or more cells that are associated with a first closed access group.
 61. A method comprising: sending, by a base station distributed unit to a base station central unit, a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate a list of one or more cells that are associated with a first closed access group; and receiving, by the base station distributed unit from the base station central unit, a context configuration message comprising cell configuration parameters of the one or more cells for a wireless device, wherein the context configuration message is based on the message.
 62. The method of claim 61, wherein the wireless device is allowed to access the first closed access group.
 63. A method comprising: sending, by a base station distributed unit to a base station central unit, an indication that one or more cells are associated with a first closed access group; and receiving, from the base station central unit, a context configuration message comprising cell configuration parameters of the one or more cells.
 64. The method of claim 63, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 65. The method of any one of claims 63 to 64, wherein the wireless device is allowed to access the first closed access group.
 66. A base station distributed unit comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station distributed unit to perform the method of any one of claims 21 to
 65. 67. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 21 to
 65. 68. A system comprising: a base station central unit comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station central unit to: receive, from a base station distributed unit, an indication that one or more cells are associated with a first closed access group; determine, based on the indication, cell configuration parameters of the one or more cells for a wireless device that is allowed to access the first closed access group; and send, to the base station distributed unit, a context configuration message comprising the cell configuration parameters; and the base station distributed unit, wherein the base station distributed unit comprises: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station distributed unit to: send the indication to the base station central unit; and receive the context configuration message from the base station central unit.
 69. The system of claim 68, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 70. The system of any one of claims 68 to 69, wherein the system is a base station comprising the base station central unit and the base station distributed unit.
 71. A method comprising: receiving, by a base station central unit from a base station distributed unit, a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that one or more cells are associated with a first closed access group; determining to send a paging message to a wireless device, wherein the wireless device is allowed to access the first closed access group; selecting the base station distributed unit, based on the message, for transmission of the paging message; sending, to the base station distributed unit, the paging message for the wireless device.
 72. The method of claim 71, further comprising receiving, by the base station central unit from an access and mobility management function, a core paging message for the wireless device, wherein: the core paging message indicates the first closed access group; and the sending the paging message to the base station distributed unit is in response to the core paging message.
 73. The method of any one of claims 71 to 72, further comprising: receiving, by the base station central unit from a second base station distributed unit, a second message comprising one or more second parameters of the second base station distributed unit, wherein the one or more second parameters indicate that any of one or more second cells of the second base station distributed unit are not associated with the first closed access group.
 74. The method of any one of claims 71 to 73, further comprising: determining, based on the second message, to not send a second paging message to the second base station distributed unit for the wireless device, wherein the second paging message is in response to the core paging message.
 75. A method comprising: receiving, by a base station central unit from a base station distributed unit, an indication that one or more cells are associated with a first closed access group; determining to send a paging message to a wireless device, wherein the wireless device is allowed to access the first closed access group; selecting the base station distributed unit, based on the indication, for transmission of the paging message; sending, to the base station distributed unit, the paging message for the wireless device.
 76. The method of claim 75, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 77. A base station central unit comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station central unit to perform the method of any one of claims 71 to
 76. 78. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 71 to
 76. 79. A method comprising: sending, by a base station distributed unit to a base station central unit, a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that one or more cells are associated with a first closed access group; and receiving, by the base station distributed unit from the base station central unit, a paging message, based on the message, for a wireless device that is allowed to access the first closed access group.
 80. The method of claim 79, further comprising transmitting, by the base station distributed unit and in response to receiving the paging message, a paging indication for the wireless device.
 81. The method of any one of claims 79 to 80, wherein the transmitting the paging indication comprises transmitting the paging indication via the one or more cells associated with the first closed access group.
 82. The method of any one of claims 79 to 81, further comprising receiving, by the base station distributed unit from the base station central unit, a response message for the message.
 83. The method of any one of claims 79 to 82, wherein the paging message indicates the first closed access group.
 84. A method comprising: sending, by a base station distributed unit to a base station central unit, an indication that one or more cells are associated with a first closed access group; and receiving, from the base station central unit, a paging message for a wireless device that is allowed to access the first closed access group.
 85. The method of claim 84, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 86. A base station distributed unit comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station distributed unit to perform the method of any one of claims 79 to
 85. 87. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 79 to
 85. 88. A system comprising: a base station central unit comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station central unit to: receive, from a base station distributed unit, an indication that one or more cells are associated with a first closed access group; determine to send a paging message to a wireless device, wherein the wireless device is allowed to access the first closed access group; and select the base station distributed unit, based on the indication, for transmission of the paging message; send, to the base station distributed unit, the paging message for the wireless device; and the base station distributed unit, wherein the base station distributed unit comprises: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station distributed unit to: send the indication to the base station central unit; and receive the paging message from the base station central unit.
 89. The system of claim 88, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 90. The system of any one of claims 88 to 89, wherein the system is a base station comprising the base station central unit and the base station distributed unit.
 91. A method comprising: receiving, by a base station distributed unit from a base station central unit, a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that one or more cells are associated with a first closed access group; configuring the one or more cells as the first closed access group; and transmitting, via the one or more cells, a system information block comprising an identifier of the first closed access group.
 92. The method of claim 91, wherein the message comprises a system information block.
 93. The method of any one of claims 91 to 92, further comprising receiving, by the base station distributed unit from a wireless device via the one or more cells, a random access preamble based on the system information block
 94. The method of any one of claims 91 to 93, wherein the wireless device is allowed to access the first closed access group.
 95. The method of any one of claims 61 to 63, further comprising receiving, by the base station distributed unit from the base station central unit, a context configuration message comprising cell configuration parameters of the one or more cells for the wireless device, wherein the cell configuration parameters is based on: the wireless device being allowed to access the first closed access group; and the one or more cells being associated with the first closed access group.
 96. A method comprising: receiving, by a base station distributed unit from a base station central unit, an indication that one or more cells are associated with a first closed access group; configuring the one or more cells as the first closed access group; and transmitting, via the one or more cells, a system information block comprising an identifier of the first closed access group.
 97. The method of claim 96, wherein the indication is a message comprising one or more parameters of the base station distributed unit, wherein the one or more parameters indicate that the one or more cells are associated with the first closed access group.
 98. The method of claim 97, wherein the message comprises a system information block.
 99. A base station distributed unit comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station distributed unit to perform the method of any one of claims 91 to
 98. 100. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 91 to
 98. 